I saw a report about the Seattle Police posting body camera video online using a YouTube page to share the video with the general populace. Seattle is one of the country's cities that has been under the Department of Justice's microscope and so this is a great way to become more transparent.
Be sure and read the linked article. You will see that this is not raw footage but that it has been redacted as appropriate. I don't see how this will work with widespread usage of body cameras, but the concept of sharing video will certainly spread to other cities and law enforcement agencies.