Years ago, I was hired by a large chain grocery store for a PT job. As part of the employee orientation, the store manager, showed us *around* the store, behind the scenes. In the video surveillance room... 4 monitors running 24/7, he said corporate sends a tech around once a week. S/he views for any problems, fusses with the equipment and only spends one hour in the store and trots off to other stores in the chain. Point being, while we all are being taped all the time, the thought that these monitors are being screened 24/7 [like in a Hollywood movie or a casino] is probably unrealistic.
They're timestamped, and searched if necessary. Much more efficient and less litigious.