The Tsar Bomba was never intended to be a practical weapon. Modern computing (ever had to read/sign a disclaimer for FEM software saying "I will use this to make nukes"?) combined with espionage at the time means that there is almost no chance that there is anything particularly useful contained in the footage.

I also read that, as well as it being detected by an American nuclear surveillance plane, the detonation wasn't actually publicly announced within the Soviet Union.