Summary: you will build surveillance technology to identify people in photos kinda like Facebook and Google
Unpacking some details:
Remember when Boston beat Vancouver a few years ago for the Stanley cup and a bunch of Vancouver fans rioted? Remember how Vancouver citizens used cloud based vision to identify and help prosecute the now sober rioters? You're gonna do something like that
for the most part you are on your own for this one. I've got a few requirements but you figure out how you want to make it work, will you offload the work to a cloud based service? will you use a machine learning library?
have fun, this needs to be in go or rust, but there is lots of flexibility here otherwise.