@Sand the point would be replicating my old two TV setup, one for gaming, playing a JRPG or something, one for TV (TV is pretty much dead). Instead, I'd have a video game, and a stream of youtube/whatever that I could then open in picture in picture and have both close to each others on one TV

So, TV can do picture in picture with inputs > put game in a corner on the TV > put a stream on the corner/next to the game

Or capture card > Open the capture card > Picture in picture anything else and have both on screen