As far as I know there is no pro videos taken durnig the whole season, but I?ve seen some amateur video shots; on one of the Great Performances Videos, (dont remember which volume but is the one which has the American Trylogy video secuence) you can see a 3 seconds or so video shot from the '69 season.
There?s a bootleg Cd which has the complete opening night.
P.S. Wasnt the Pink and Blue stage colors so cool! I think were the best ever used followed by the stage used on summer '74