Funny thing is that ANPR is a solved issue that you can literally run on-device with minimal training. As in, you can literally run it on a $30 WiFi camera. With existing open models.

Facial recognition is a bit more tricky but there are open AI models that translate facial data to what is essentially a hash that can be compared to other faces with high precision, and that too can run on the same hardware.

Hell, my cheap $100 smart doorbell has built in facial recognition that doesn't require any cloud connection or such. All on-device.