Is it possible to do a speedrun with Metal Sonic for the category "level only"?

hello I would like to propose a game but I do not understand the rule of the video

I have to make a video showing part of the game only? to do the whole game? I saw "Examples include: 1-1 Individual Level, Tutorial%, Fastest Death." but I did not understand. (my englsh is very bad> < sorry)

made a video of the game until the 3rd world, showed 2-3 dead and a game over, that's enough?

the game is yoshi in sonic 2

(English translated version)

would like to know how to make a valid run if OBS does not work, during my first run () OBS had this problem and my run was rejected (which is normal, I understand it) Do you have any advice?

(original version : french ) je voudrais savoir comment faire une run valide si OBS ne fonctionne pas , lors de ma première run () OBS a eu ce problème et ma run a été rejeté (ce qui est normal , je le comprend ) auriez vous des conseils ?

for the run to be valid, is it possible to use a mod to change the character that does not change the game's physics ? (I would like to play with sonic boom character rather than sonic modern)