As far as getting the video, I can tell you what happened to me about 2 years ago.
I was leaving Home Depot in Arnold Mo, through the contractors/pickup entrance. If anyone has ever been to a Home Depot, you know this area is seperate from the parking lot and road goes around it. In other words you have to intentionally drive in to be in the area. Anyways, as I was leaving with a bulk item, my daughter walking by my side, she sees something shiny on the ground in the middle of the area and runs ahead of me through the doors to go see what it is. Take in mind I am right there and go after her because I DONT let her wander. At the same time someone in a white Ford sedan sees apparently sees her bent over, revs his engine, intentionally whips into the area then slams on his brakes stopping right in front of her, then starts reving his engine, like he was going to run her over, making a big joke about it. Another person loading wood grabs her, I run over and reach into the car and grab this guy by his shirt and face, wherever I could grab, he wrestles free and takes off. We go inside, inform HD and call the police. They (police) refuse to do anything saying it sounds like it was some kind of misunderstanding, and if anything I assaulted this guy, they said they arent even going to take a report. (To protect me from being charged, of course they say) The other guy tries telling them just as ferishly as me, NO this guy did this intentionally, like he was making some kind of sick joke of running down a child. But it all fell on deaf ears. I tried to get them to at least go look at the surveilance tape. They kept asking why. I asked why they wouldnt at least try to track down the guy and talk to him. NO NO NO. So my next step was to try to get the tapes from HD myself. I talked to the store manager, thought it might happen, two days later was told I wasnt getting anything unless the police themselves supeona d them. Crap about privacy laws and such.
So I can relate to the runaround about business's releasing these tapes. They arent going to unless they absolutely have to. And if the police wont get involved, you are pretty much out of luck.