A probably never-ending story, and subject to updating, but here is Marc Behrens’ YouTube channel.
So far, some live-performances and documentary videos of installation projects have been uploaded. Check out Behrens’ ongoing exploration of the subjects of mass air transportation vs. mythological creatures who supposedly live in the skies («Clould») or move backwards in time and watch the duo Behrens Heyduck (Marc Behrens and Nikolaus Heyduck) play with plastic waste in 2001 («Plastic»).