Is the guy in the red Belzagor from Slavland (Poland)? The tag on the video seems to indicate that it is, but I'm not sure. It certainly could be him, as he plays bagpipes (among many other instruments) on the albums.
The author of the video has posted several other clips from the same event with "Slavland" among the tags. The music in many of the clips sound as if it could have been taken right from the folk moments of his albums.
Hmm... it looks like fun, regardless.