A challenge for sure, I took the HD video version and extracted the audio and loaded it in Audition and took a noise print from the very beginning and used that with the noise reduction filter. At about 50% reduction it sounded pretty good with the singer and guitar while blocking most of the background noise being reduced. I was surprised how good it sounded, not perfect but definitely better.
Attached is a small sample of audio at 50% reduction.
3957_videosample1.mp3.zip