If what will work is the Voice of Authority, then you can tell your DH that my DH and I were in the developmental pediatrician's office not two weeks ago with a tape of my son totally freaking out during his Consecration ceremony. (DH wasn't intending to tape him acting nutty, we was actually hoping for a nice tape of an important religious milestone, but that's not how it went...) Anyhow, we thought the tape would be very useful for the dev ped to see the triggers of the stimming behaviors, which stims he resorted to, to talk to our son about about what he was feeling in that moment, etc. The doctor DID find it useful as a dxing tool, but he made a huge point of promising our son that nobody would ever deliberately make a tape of him that he would be embarrassed to see.
And he told us to switch off the tape next time the misbehavior starts, because he's now seen what he needed to see and no good comes from having that stuff around.
So. There you go. A licensed professional with a white coat and a prescription pad says that deliberately making humiliating tapes of small children is a big no-no.