I have a MIT-licensed Claude plugin exactly for this:

https://github.com/mrieck/demoday-claude-plugin#top

Claude drives the app while recording, writes a script, generates a video with an AI avatar, cuts the video using Remotion. Tutorial videos, promo, listicle, I use it for all of those.

The only thing you need is your own Fal.ai api key. 1 min demos take Claude about 30 min to make, and cost $2-$3 in API costs.

Pretty much all of the coding LLMs, Claude, ChatGPT, etc. can generate a product demo. I had Replit make my product demo. For a personal presentation, Loom allows you to edit your presentations wordings directly for that two minute video of yourself which you make from your computer monitor.

It's easy to make one with your local agent (Claude Code, Grok Build, etc.): https://www.youtube.com/watch?v=5hv8LN5iB8g