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Make AI Whiteboard Explainer Videos on ChatGPT Codex - 2026 Guide

A complete beginner's walkthrough for making AI videos with Golpo inside Codex — OpenAI's coding assistant. No coding experience required. Install Codex, sign in, install the Golpo plugin, paste your API key once, and then make videos in plain English. Plan for 15–20 minutes the first time and under 2 minutes per video after that.

Shraman Kar10 min read
A beginner's walkthrough screen showing Codex generating an AI video with the Golpo plugin

This guide assumes you've never used Codex before and you're not a developer. You just want to type a sentence and get a video. We'll do it together, step by step. Plan for about 15–20 minutes the first time, then under 2 minutes per video after that.

What you'll need before we start

  • A Mac or Windows computer (this guide covers both).
  • An internet connection.
  • A Golpo account with API access enabled. See how to get Golpo API access for plan options and how to enable API on your account.
  • An OpenAI account (a free ChatGPT account works fine).

That's it. No coding experience required.

Step 1 — Download and install Codex

Codex is OpenAI's coding assistant. We're going to use it to talk to Golpo.

On a Mac

  • Open Safari or your usual browser.
  • Go to chatgpt.com/codex.
  • Click the Download for macOS button.
  • A file called something like Codex.dmg will download.
  • Open your Downloads folder, double-click the .dmg file.
  • A window opens showing the Codex icon. Drag the Codex icon into the Applications folder shown in the same window.
  • Open your Applications folder, find Codex, and double-click it.
  • The first time you open it, Mac will ask: "Codex was downloaded from the Internet. Are you sure you want to open it?" Click Open.

On Windows

  • Open your browser.
  • Go to chatgpt.com/codex.
  • Click the Download for Windows button.
  • Open the file that downloaded (usually Codex-Setup.exe).
  • Windows may say "Windows protected your PC." Click More info, then Run anyway.
  • Follow the installer (just click Next through the defaults).
  • When done, find Codex in your Start menu and open it.

✅ What you should see: The Codex app opens. You'll see a sign-in screen.

Step 2 — Sign in to Codex

  • Click Sign in with OpenAI.
  • Your browser opens. Sign in with your ChatGPT account (the email and password you use for chatgpt.com). If you don't have one, sign up at chatgpt.com first — it's free.
  • After signing in, you'll see a "Codex authorized successfully" message. Close the browser tab.
  • Switch back to the Codex app. You should now see the main Codex window with a chat prompt at the bottom.

✅ What you should see: A window that looks like a chat — there's a big text box at the bottom where you can type things, and the rest of the window is mostly empty (because you haven't started yet).

Step 3 — Get your Golpo API key

The plugin needs to know who you are when it talks to Golpo. That "ID badge" is called an API key.

Before you grab a key, make sure your Golpo account has API access enabled. The fastest path is the full walkthrough at How to Get Golpo API Access — it covers plan options, how to turn API access on, and where the key lives. Once that's set up, come back here.

Then, in your Golpo dashboard:

  • Sign in at video.golpoai.com.
  • Open your account menu (top right with your initials or photo).
  • Find the API or API Keys section (usually under Settings → API).
  • Click Create API Key (or Generate New Key).
  • A long string appears, starting with letters and numbers. It looks like:

sk-golpo-1234abcd5678efgh...

  • Copy this entire string. (Click the copy button next to it, or select and ⌘C / Ctrl+C.)
  • Paste it into a safe place temporarily — open the Notes app or a sticky note. You'll need it in a minute.

⚠️ Important: Treat this key like a password. Don't paste it into chats, emails, or share it with anyone. Anyone who has the key can use your Golpo account.

✅ What you should see: A long alphanumeric key copied somewhere safe, and API access enabled on your Golpo account.

Step 4 — Open a terminal (just briefly)

Now we need to tell Codex about the Golpo plugin. We do this once, with one command.

On a Mac

  • Press ⌘ + Space to open Spotlight.
  • Type Terminal and press Enter.
  • A small window opens with a blinking cursor. That's the terminal. You can type into it.

On Windows

  • Press the Windows key.
  • Type PowerShell and press Enter.
  • A blue window opens with a blinking cursor. That's PowerShell. It works like the Mac terminal for our purposes.

✅ What you should see: A black or blue window with a blinking cursor. Don't be intimidated — we're only going to type 2 commands in here, total.

Step 5 — Add the Golpo marketplace

In the terminal, copy and paste this exact line, then press Enter:

codex plugin marketplace add Golpo-AI/golpo-claude-skill

(On Mac: ⌘C to copy, ⌘V to paste. On Windows: Ctrl+C / Ctrl+V.)

✅ What you should see: After a few seconds, a message like:

Added marketplace `GolpoSkill` from https://github.com/Golpo-AI/golpo-claude-skill.git

⚠️ If you see an error:

  • codex: command not found — Codex isn't installed yet, or your terminal can't find it. Try closing and reopening the terminal. If that doesn't help, reinstall Codex from Step 1.
  • could not resolve host github.com — Your internet is down or behind a strict firewall. Try a different network.
  • unknown variant ON_FIRST_USE — You're getting an older cached version. Try codex plugin marketplace upgrade to refresh, then retry. If still broken, run codex plugin marketplace remove GolpoSkill first, then re-add.

Step 6 — Install the plugin

Still in the terminal, paste this and press Enter:

codex plugin add golpo@GolpoSkill

✅ What you should see: A message like:

Added plugin `golpo` from marketplace `GolpoSkill`.

Installed plugin root: /Users/yourname/.codex/plugins/cache/GolpoSkill/golpo/0.2.1

The plugin is now installed. You can close the terminal — we won't need it again.

Step 7 — Make your first video

  • Open the Codex app (still running from Step 2, or reopen it).
  • Click New conversation (or open a new thread — usually a + button somewhere visible).
  • In the text box at the bottom, type:

Make a 15-second video about why the ocean is salty.

Press Enter (or click the send button).

What happens next

Codex will respond, doing things one at a time. You'll see it:

  • Recognize the plugin — it'll mention "Golpo" or just start running.
  • Check the environment — runs a quick test to make sure everything is set up.
  • Ask for your API key (first time only) — it'll say something like: "I need your Golpo API key. Please paste it here." Paste the key you saved in Step 3 and press Enter.
  • Submit the video job — you'll see JOB_ID=abc123....
  • Stream progress — every few seconds:

progress=10% status=generating

progress=35% status=generating

progress=60% status=generating

progress=90% status=generating

  • Download the finished video automatically to your computer.
  • Show you the result — two clickable things:

VIDEO_FILE=/Users/yourname/Golpo/videos/20260603-130522_why-is-the-ocean-salty_a1b2c3d4.mp4

VIDEO_URL=https://...mp4

⚠️ How long does it take? A 15-second video takes about 1–2 minutes to generate. Longer videos take longer. While it's running, you can do other things — just don't close Codex.

✅ Success check: You see VIDEO_FILE=... and VIDEO_URL=.... Both should point to a video file. Click the local file path — it should open in your video player (QuickTime on Mac, Movies & TV on Windows).

Step 8 — Find your video on your computer

By default, every video you make is saved here:

  • Mac: /Users/yourname/Golpo/videos/ (Open Finder, press ⌘+Shift+G, type ~/Golpo/videos/, press Enter)
  • Windows: C:\Users\yourname\Golpo\videos\ (Open File Explorer, paste %USERPROFILE%\Golpo\videos in the address bar)

You'll see files named like:

20260603-130522_why-is-the-ocean-salty_a1b2c3d4.mp4

The format is: date-time_topic_uniqueID.mp4. Most recent files are at the bottom (or sortable by date). Double-click to play.

Step 9 — Try variations to get comfortable

Now that it works, try changing things to see how it responds. In Codex, type any of these:

  • "Make it a vertical short instead." — Same topic, 9:16 format for phones.
  • "Try a male voice." — Same video, different narrator.
  • "Translate it to Spanish." — Same video, Spanish narration.
  • "Make it 1 minute long." — Longer video.
  • "Use a more colorful style." — Switches to Golpo Canvas style.
  • "Add background music." — Adds music behind the narration.
  • "Save the next one to my Desktop." — Changes save location.

You don't need to remember command syntax — just describe what you want in plain English.

Step 10 — Make a video from your own content

The plugin can also work with files you have:

From a PDF

  • Drag a PDF onto the Codex window (or note its path, like ~/Documents/report.pdf).
  • Type:

Summarize this PDF as a 1-minute video: ~/Documents/report.pdf

Codex uploads it to Golpo, then generates the video.

From your own narration audio

  • Have an MP3 ready (under 15 MB).
  • Type:

Use this audio as the narration: ~/Desktop/myvoice.mp3

The video animates around your audio.

From a script you wrote

Make a video using this exact script: "Welcome to our company! Today we're going to talk about..."

Troubleshooting — when things don't work

  • Codex doesn't seem to know what Golpo is. Be more specific: "Use the Golpo plugin to make a video about X."
  • "API key invalid." Your key is wrong or expired. Go back to video.golpoai.com, make a new one, and tell Codex "My API key changed, please update it."
  • requests_ok=false — Codex needs a Python library. It'll tell you the exact command — usually pip3 install --user requests. Copy-paste that into your terminal.
  • Video never finishes. Long videos can take up to 90 minutes. Be patient. If still stuck, ask Codex "What's the status of the video?"
  • "403 Forbidden." Your Golpo plan doesn't include the feature you tried. See How to Get Golpo API Access or check current plan availability at video.golpoai.com.
  • "429 Rate limited." You're making videos too fast. Wait a minute and try again. Don't run more than 3 jobs at once.
  • Codex feels stuck. Press Ctrl+C in Codex to cancel, then try again with a simpler prompt.
  • You hate where videos save. Tell Codex: "Save videos to ~/Desktop instead."

How to check what you've made

Ask Codex any of these:

List my last 10 videos.


Show me my Golpo usage.


Re-download video [paste video ID here].

How to remove Golpo later

If you don't want the plugin anymore:

  • Open a terminal (Step 4 again).
  • Type:

codex plugin remove golpo@GolpoSkill

Press Enter. Your existing videos in ~/Golpo/videos/ stay on your computer. You can also delete those manually if you want.

To remove the marketplace too:

codex plugin marketplace remove GolpoSkill

Quick reference card

Save this for later:

INSTALL ONCE:

codex plugin marketplace add Golpo-AI/golpo-claude-skill

codex plugin add golpo@GolpoSkill


USE (in Codex chat):

Make a 30-second video about [topic].


FIND VIDEOS:

Mac: ~/Golpo/videos/

Windows: C:\Users\you\Golpo\videos\


UPGRADE THE PLUGIN:

codex plugin marketplace upgrade


REMOVE THE PLUGIN:

codex plugin remove golpo@GolpoSkill

What's next

Once you're comfortable, try:

  • Long-form content — paste a 500-word script and let Golpo voice it.
  • Multilingual — make the same video in 5 languages by changing one word.
  • Branded videos — Codex can add your logo to videos.
  • PDFs to explainers — turn research papers, reports, even legal docs into watchable summaries. See How to Convert a PDF into an AI Explainer Video.

Everything you can do via the CLI helper (golpo.py generate --flag value), you can also do by just asking Codex in plain English. The plugin handles the translation for you.

Need help?

Further Reading

Have fun making videos. The first one feels like magic — every one after that is just one sentence away.

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