Windows Hello is a relatively cumbersome concept, but I would still consider it OK if it was built into a notebook. However, with a camera that can do that, you get a huge beating. These Hello solutions are anything but compact. I would rather prefer a USB fingerprint Hello solution. Because these Hello-enabled cameras are already very large and doomy.

Face detection only works when the lens of the camera is open. It does not work when the cover is closed.
W.F.

No idea. I only use Mac.