You need to improve your AI person detecting algorithm to include people approaching the camera wearing a hat and looking down.
Delivery guys dropping off parcels often walk up my driveway in full view of the camera, but are not identified as a human because their faces are hidden under the brim of their cap.
Conversely, every car that drives past is a human because the wheel looks like a face.
Surely your algorithm is looking for more than just face in detecting determining if a human is approaching?