True, but if his priority is his pride and joy, then forget about anything else. Don't mix it up with a personal agenda to be seen as 'smart'.
It is also intrusive to be secretively filmed at work. I cetrainly wouldn't like it. Like anything else about intrusion of privacy, it should only be done if there is 'reasonable grounds' for suspicion. What if the mechanic e.g had an affair with the secretary.
I don't have the camera, but the one I've seen onare battery operated