i think it is going to be very close now
they do differently than what u might think, i guess.
instead of tacking the problem directly, they will implement indirectly by detecting (1) person; (2) vehicle; (3 -maybe later) pet. u can choose when u want to be notified - person/vehicle while ignoring others.
there is beta test on detecting person, vehicle, person+vehicle, the detection of person is very accurate whereas vehicle less so. once thy sort out this, it is easy to implement on app.