RE: camera on Blade cp/ pro
really the only thing that will be hard on the heli is the extra weight, which will mostly be hard on the motor, but if you get a setup that isn't too heavy, you should be fine. It also makes the heli less manuverable, so you have less controlability and manuverability.
Also about the nitro's, I do believe there could be a few good setups with it, but when filming you would have to consider the sticky gooey mess that nitro leaves behind. I've seen some good links along the way, unfotunatley though I cannot find any of them.
There has also been some talk lately about the AMA banning arial photography and videography, but I don't really know what that is all about.