If you can add subtitles that should be ok. Maco and I are the ones judging the videos so It would be a good idea to make sure that we can understand the video. By all means do it in your first language tho. This is all to help promote 42 and get the word out and what better way than direct the video to other people who speak your language.  

You could also make 2 versions of your video, but that is up to you. If you make 2 versions we will judge the one done in English.

If you post a video in your native language please add subtitles so that Maco and I can understand the video. I speak a little french/spanish/german, but only enough to ask where the bathroom is. lol