Then i looked into Task Manager and found out, that the nvidia game clip thing is using quite a bit of gpu power. Then i was thinking, if you could maybe use for intel hd grafics for stuff like that, so you have your real gpu for games and stuff. Would something like this be possible?
No, not possible. For one, that requires an Nvidia GPU and secondly one GPU can't "see" what the other is doing, so it can't record whatever the other GPU is showing on screen.