Well, it's a bit of a pipeline, I use a custom project to have an API to be able to send files or urls to summarize videos.
With yt-dlp I can get the video and transcribe it with fast whisper (https://github.com/SYSTRAN/faster-whisper), then the transcription is sent to the LLM to actually make the summary.

I've been meaning to publish the code, but it's embedded in a personal project, so I need to take the time to isolate it '^_^