Christopher Nolan's "Snakes on a snake".
As for ROC's idea, I see it playing out in my head as more along the lines of "Disturbia". It's the operator of the vehicle (or whoever is in charge of taking the pics) that takes notice. He/she sees something suspicious (and maybe ties it together with a small piece of evidence he/she recalls from when driving by), reports to higher-ups, but nobody takes him/her seriously. From there, of course, it's rogue investigator, ultra-paranoia, the audience can never trust if what we're seeing is real or blown out of proportion, etc.
Starring Rory Caulkin! No, really. Saw him in "Scream 4" -- I kinda like him. Too bad the movie sucked, but he's pretty cool.