I'm gonna ignore the fact that this is the wrong forum,and try to help you. The oldest Queen videos are
Rainbow Theatre 1974-03-31
Rainbow Theatre 1974-11-19/20 (official)
Hammersmith Odeon 1975-12-24
Hyde Park 1976
Earls Court 1977
and many others
You can find them all here. No video before Rainbow March 74 exists