> I'm sorry, but if you are literally marching down the street in a parade, you lose the claim of "privacy".

True and that assertion holds as well in germany. The issue with the techno-viking video is that he is not shown as part of the parade, but specifically and personally filmed and made the center of the video. This is the point where it crosses the line from filming a public parade with the techno viking being part to filming the techno viking as a person. The first would be completely legal, the second requires a permission of the person.