I live in an apartment and my tv is connected to the entry phone cctv. It is an added security for me as I can see who is coming in and I can be sure no one is following them. I’ve previously had 2 friends turn up and I sent both away. Even a few weeks ago 2 friends came together to the new place because I could see them on the TV I could stop them and let them know only 1 person is allowed before I gave my apartment number.
If it’s a house, the camera could be recording throughout or when the bell is rang so I’ll say be careful. Maybe notify clients not to ring the bell in case it records when it’s rang and you just open the door when they arrive.