That's only official part. Having cameras you can track a lot. 1. recognize people 2. track who is interacting with whom 3. track who personally pays attention to what ads on the screen 4. get some clues about health and wealth. personalized and average 5. if cameras come with microphone arrays, 'for gunshot detection', you can listen selectively. +recognition, remember? 6. Read smartphones' screens.

Now all this in hands of private company. Ready for sale.