Jetson nano connected to cable box

Hello I am planning to buy a Jetson Nano and connect to my tv cable box then take the video/audio stream from my cable box and do some video amd audio processing on it.

I have done that with pynq-z1 board using hdmi splitters but the board was too slow for me so I was thinking I can do that with the nano. My question is have someone tried that before on the nano ? Any extra hardware that I need to buy ? I know the nano itself doesn’t support hdcp but the splitters do bypass hdcp.