That's unfortunately really hard to prove since it'd be very easy to cheat that way, you can try downloading OBS Studio, it shouldn't be super hard to overlay facecamn on gameplay. Also I'm gonna Add a Blindfolded Any% but delete the All medals, that way there's no clutter and u can hopefully get a run, good luck!
Hi! We don't wanna pad the categories with too many gimmick-y categories. All Medals is already the most hype run to be Blindfolded possible (The perfects all pop in random order so it'd be physically impossible to speedrun blindfolded). And even then, All Medals blindfolded has no runs so far, so there's no reason to add more if there aren't any runners, are you interested in running one of these catgeories blindfolded?
If the timer records completely in-game -like The Arena and The True Arena- is it ok to use Dolphin Emulator? There should be no advantage or disadvantage in the progress if the recorded time is in-game.