you don't get the notes of someone's presentation online, you just get the video.

These days in my experience you don't get the notes, you get the PowerPoint file, which is (a) bloated, (b) of limited use to someone running in a Microsoft-free environment (though OpenOffice is quite good these days, it has to be said), and (c) often barely intelligible without the context that the presenter would have given during the actual talk.