I suppose the title says it all. In addition to pure audio recordings, which were introduced a few months ago, IMSLP now officially supports video recordings! This idea was, in fact, of rather recent conception: the very nice video performances of pianist Marco Alejandro Gil Esteva recently submitted to IMSLP convinced me that the time is ripe for officially supporting video recordings.
So how does one submit video recordings? The same thing one does to submit a normal audio file. Simply upload the file using the “add audio/video file” links. The video file formats currently permitted are AVI, MKV and MP4.