The%20Best%20Video%20Doorbell%20with%20Facial%20Recognition%20%u2013%20Review%20Geek: Facial recognition takes this a step further and not only detects a person, but can also detect who that person is, specifically. So with a little help from the user and after a few weeks of learning, the camera can eventually know exactly who came to your door, whether it was the postal worker or your neighbor.