Earlier quoted context omitted.
I really hate that the answer offered to many modern social problem seems to be "more surveillance". I'm not saying it wouldn't help or that we shouldn't do it but like police body cams this is only as effective as the people charged with following through on the consequences. If a company retains control of the camera and wants to bury the evidence they'll still do it.
Yes, I think the recordings should be under the control of the employee who requested the camera. It should be their choice what parts, if any, to show the company — and they should have the ability to show them to a lawyer if they choose. Your concern is very reasonable, but that's why I didn't suggest just blanketing the office with surveillance cameras.
It’s not necessary either. The downside of capturing everything is that you capture everything. The employee ends up getting canned for claiming a 30 minute lunch when she was gone for 40. A good, factual journal is the best weapon in most cases.