Why do you want to feed it with videos?
Don't you just want to feed it the contents of the video ? (Transcript)
If so, then the easiest way is to use chatgpt and summarize plugin. It will produce a nice summary and transcript of the video. Additional hint: If you want the bot to efficiently answer questions based on your videos, ask chatgpt to generate QA for the contents of the video. Then supply this to Knowledge Base as a .txt file