I, having enough time on my hands (and not only in these covid-19 times) could take care of it. The procedure is not very clear to me: whoever wants to contribute with a video puts it on Google Drive, Dropbox, Youtube, etc. and then gives me the address. I unload it and then upload it to the channel. Are there other ways? My 2 cents: I wouldn't be rigid about video requests; good video/audio quality with nice intro. For the rest I'd leave the length free (yes, I also think that "short" means more appeal, but some IgorBeg videos that are essential would be left out); put a voice or not. The important thing is, if there's voice or subtitles, they're also or only in English).
From the beginning this community has decided that the only official language is English. If it were up to me, I would teach Italian to all of you... ;-) Once we have reached a certain number of videos we could put the links on the Manual, because they would help the understanding of the text. Within the channel you could create playlists for each contributor.