Too confusing. There is already a permission prompt for camera access, so now there'd be two prompts, or it's still one prompt but the text is different in either case, which users can't be expected to understand.

You can go into about:config and explicitly undo this setting if you're in some weird dev corner case where it's a problem, but you should definitely put "Stop doing AV stuff in an insecure context" near the top of your TODO list.