I, as a single person working on a maker conference thing, did a facial recognition system that relied on no GPU or internet anything. I did this in 2015.

That's just a lone hacker doing shit outside of work... And my solution can go through directories of images, realtime video stream, videos, and ipcams.

So yeah the cat is out of the bag. The bag was shredded, and the cat has had 3 litters of kittens.

Any video system could be retrofitted as a facial recognition system... Or even process videos after the fact.