There's no standard Midi "notation" that's human-readable/writeable AFAIK - even written out in, e.g. hex, I would be flabbergasted if anyone could perform from

There's no standard Midi "notation" that's human-readable/writeable AFAIK - even written out in, e.g. hex, I would be flabbergasted if anyone could perform from a displayed Midi file. The YT video appears to show a piano-roll type display (common for DAWs etc.), nothing to do with midi (which doesn't even have the concept of notes or note lengths at all).