Actually, it's really hard to make it ultra reliable. 30 frames per second, 82K seconds a day, possibly hundreds of cameras...10^8 frames daily. False alarm rat

Actually, it's really hard to make it ultra reliable. 30 frames per second, 82K seconds a day, possibly hundreds of cameras...10^8 frames daily. False alarm rate of 0.01% makes for thousands of interruptions. That's the difference between a school project and a system you can sell.