Those links don't support the ability to active track a million people. It's just a 360 degree camera used to track insurgents during combat. It's not tracking every person in a city over a period of time.

  The array of cameras on the aircraft that flew over 
  Compton can record high-resolution images of a 25-square 
  mile area for up to six hours. It can track every person 
  and vehicle on the ground, beaming back the pictures in 
  real time.


  It’s city-wide surveillance on an unprecedented scale.


  What we essentially do is a live version of google earth 
  only with a full TIVO capability, it allows us to rewind 
  time and go back and see events that we didn’t know 
  occurred at the time they occurred.

[0] http://www.pbs.org/newshour/bb/new-police-surveillance-techn...