I agree some may have trouble recording but almost every other game requires video evidence and no one complains there so I am gonna say video evidence is required
For categorys:
Any%- no major glitches but all else is fair game
100%- you must kill all enemies (also no major glitches)
Glitch% -all glitches are allowed get to the milk as fast as possible and by any means necessary
-what is and isn't a major glitch will be decided by the community
And you can run a single level or the whole game, also splicing is not allowed in any category