I remember reading something about some hi tech stuff on video profiling in the group here not too long ago, it's like some fancy high tech CCTV hardware and software combination where the video is compare against a database for facial recognition, software assist auto tracking, ...
I'm buying a house that has an ADT system installed. Pretty basic system, just the front, back, and basement door, plus one motion detector. The house is a repo, so I won't be getting any codes from the previous owner.