Ascalon's dashboard

You don't need a permit for general filming on the street in Ann Arbor, according to City Hall. If you're going to close roads, block traffic, use hazardous equipment or otherwise cause an obstruction then, yes, you are going to need some kind of permit to close off a street in whole or in part, but that would be for any activity, not just filming. Ask at City Hall if you're doing any of those things, otherwise, just go out and make your film.