The Les McCann video was recorded using cathode ray tubed black and white TV cameras in 1969. We are fortunate to still have a recorded document of that historic event at Montreux. Most of the tapes from that era are in far worse shape.
I managed to pick up a reissue/remastered CD of the concert over the past week. It was reissued on RHINO records under Les McCann & Eddie Harris: Swiss Movement Cat #: R2 72452.