You can find this excerpts ONLY in Days Of Our Lives documentary, the rest is in private collection. Maybe in the Brian May Collection.
This footage was actually shot by Morgan Fisher, keyboardist with tour headliners Mott The Hoople. He shot 40 minutes of footage, which he has issued on a DVD available from his website. There is a trailer at https://www.youtube.com/watch?v=_xMY3MB9eyE
I've not seen the full film, but given that the Queen footage in the trailer is essentially the same as in the first video, I expect that this may be the sum total of their appearance in the footage shot (which unsurprisingly is mostly of Mott members & crew).