Dutch filmmaker Mark Bakker has made a documentary about the "Folk Flest" concert at Nidarosdomen last autumn.
It will be available as an extra when the entire concert is released (as record and DVD) in april.
There's one chance to see it before then, and probably the only chance to see it in a proper cinematic setting, though, at Kosmorama International Film Festival in Trondheim on march 2nd.