I would like to know how to produce this effect, for example on 1. YouTube Livestream, 2. Zoom, or 3. Omegle meetings. Thank you for your thoughtful answers/comments in advance!
See this video:
- One is the spot with the piano in his own room:
- Another is like Synthesiagame https://synthesiagame.com/ on the screen during the Omegle meeting: