I have serious doubts about the authenticity of that video. Fourth of July in DC, and no crowds? No people at all!
If it is determined to be genuine I believe he will be arrested, unconstitutionally though. If the police determine it is bogus, there is nothing they can do. They will probably check webcam footage they already have with his to check for validity.
I appreciate what he is trying to do, but putting a phony video out there is only going to hurt him.