personally i don't have a cctv setup at the moment, so i can't give any recommendations, but you'd be looking for POE capable cameras, and you'd need a POE enabled switch, and a computer connected to that switch in order to handle the incoming data, including software obviously. But it's probably also dependent on the camera itself, nicer cameras are probably going to be more flexible.

there are plenty of decent videos about homelab based CCTV setups out there if you're looking to dig into them a bit more.