Awesome, I have built product called Clofus with face attendance using similar technology using CCTV camera footage for a school and we have can help build this system, google "Clofus"
we have built such a platform and I can show a demo too, my technology proposal is to use WebRTC and socket IO for video streaming and nodejs mongodb as backend, I am sure you will be happy to find me and we are interested to work with clients long term, looking forward thanks :)