Activating the camera and/or the microphone remotely without notification, on non-corporate owned premises may be illegal. There are wiretapping laws, etc.
Just because I own a microphone and camera doesn't mean I can use it unknowingly in your home. Even if you were to borrow it and willfully bring that camera and microphone into your home, there are reasonable expectations of privacy that can't be violated.
If I explicitly said I'll be using that microphone and camera to record you, made that very clear, and had you sign off on it without duress, then there may be grounds. The problem is, as a condition of employment, at least for me, would be a form of duress. If it becomes widespread and everyone caves into signing off on that sort of recording, then itll start to lose strength as being a form of pressure.
