There are some professionally filmed bits available - Now I'm Here, Bohemian Rhapsody and We Will Rock You (Freddie throwing bananas).
Video - downloads
an updated version of what Chinwonder2 did a while ago: linkmega.nz: link
Bits and pieces
The famous footage of Freddie Mercury on Superman with bananas comes from this concert.
Line-up
Freddie Mercury (lead vocals, piano, tambourine),
Brian May (electric guitar, backing vocals, acoustic guitar),
Roger Taylor (drums, lead vocals, backing vocals, timpani, tambourine),
John Deacon (bass guitar)