The Wild One
Starring Willem Dafoe, Jack Garfein, Peter Bogdanovich, Blanche Baker, Irène Jacob, Bobby Soto, Patricia Bosworth, Dick Guttman, Geoffrey Horne, Foster Hirsch
It's a documentary movie, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Germany.