It would depend on the video and what it shows, along with local regulations on release of such video. Other considerations would be if the contents contain information about people that shouldn’t be released, if it’s part of an ongoing investigation, and other factors.
The upshot is there’s no single answer. Sometimes they can be leaked, yes. And some departments/states have policies requiring release of video, or response to public information requests, but all of that comes with the caveat of “it depends”.
(all of the above is written assuming that you’re asking about the United States)
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