I work in the security industry installing alarm and CCTV systems, gate motors and electric fences, electronic access locks (RFID/facial recognition stuff) etc.
Basically everything I install is to keep you and yours safe, and it uses a myriad of different technologies to that.
Take alarm systems for example: besides the myriad of makes and models out there, they all use different software to get the job done, from a simple arm and go, 8 device system, all the way up to 128 device systems that require literally kilometers worth of cabling however the basic premise is still the same with what all these systems are supposed to do, albeit through different means.
CCTV on the other hand doesnt have as many reputable brands and generally use very similar software, however some cameras and software are head and shoulders above the rest. We'll use HikVision as an example here: on the newest DVR (Dedicated video recorder(the main box of any CCTV system)) systems the DVR comes built in with AI that can detect human and vehicular movement in each cameras line of sight and notify you about it. Recently camera technology has progressed to allow full colour picture at night instead of the old IR black and white video feed at night, which also allows the AI to work even better. I could also go on about IP/network cameras which dont even need a DVR to work, just a network connection and can be linked to other buildings a good few kilometers away with some nifty wireless network setups.
And speaking of AI lets not forget that cameras also come with it built in now: take the cameras we use for neighbourhood watch for example: they can identify vehicle license plates, faces and a whole myriad of things, and then screenshot and ping the user about the presense of said beings. This is most commonly used currently in law enforcement to track down stolen vehicles and criminals and isnt usually installed at private residences.
On a similar note: cameras which are dedicated to license plates can be installed on estates and housing complexes to identify certain vehicles and automatically open the gates for said vehicle, saving users the hassle of using a remote or phone to open/close their gates.
And a side note: the cameras in the newest electronic locks with facial recognition can (depending on model) recognize people through masks or even if they wearing glasses or have since grown a beard.
