You may want something like https://jetkvm.com/ or https://pikvm.org/. They will do the video capture and keyboard/mouse input.

Also check out https://symless.com/synergy. I really like it for using my work laptop next to my desktop. It doesn’t do video, but extends your mouse and keyboard to other computers.

Benn Jordan tends to make longer videos, but they are always worthwhile. If he releases a 40 minute video about a topic I don’t care about, I’ll still jump to watch it because he’ll make it interesting, and I’ll probably end up caring about it by the end.