Police behavior is such a broad ranging topic, simply having their actions recorded does nothing to solve the root of the problem. One of the topics I'd like to see addressed is their 12 hour work day. For what appears to be an enormously stressful job, it seems like some form of torture to ask law enforcement to always be on duty for such long stretches at a time. I really think that to get back to the 'To Serve and Protect' mantra we need to start treating policemen like humans first.
You can keep the data open to the public with some constraint. Such as, you can request a copy of video from a certain timeline if you are on the video or have the permission from someone on the video. If you can prove such information, then they have to hand it over.
I'm more interested in how to handle the news media on this type of thing. It would seem maybe the media cannot access the video unless they have similar permissions or if the video has been submitted as evidence in some way.