I'd like to disagree. I think an employer (or any person) has a right to place a video camera any place on their property they could otherwise hire a person to

I'd like to disagree. I think an employer (or any person) has a right to place a video camera any place on their property they could otherwise hire a person to sit and watch. This person can see things and testify to them, essentially functioning as a meat video camera. Why do employees expect not to be seen by their employers in working areas? or public break rooms? How is placing a camera different than hiring an overseer?