As far as what you see at 21 seconds in, that isn't Cinnamon (i think) you are referring to 'Lightworks' (video-editor) that is running on linux - in it's alpha program, that has been mentioned in many articles here ~ i got into the alpha program and have been testing it! ... I've already had some bugs fixed I assume that's what you are referring to (blue screen?) because the only other desktop is MacOSX in the video.
Yeah, I was reffering to this program. It looked like a DE to me, because of Unity like panel on the left.