As I know with an Nvidia GPU Quadro RTX 4000 it is possible to use GPU accellerated decklink input. Decklink quad 2 cards are also claimed to support this GPUDirect for video. But it may also be dependend on the application. Anybody knows if casparcg supports GPUDirect for video with decklink input cards?
No, this hasn’t been implemented as far as I can tell