Download vdownloader ( http://www.clubic.com/lancer-le-telechargement-48222-0-vdownloader.html ) then install it.
Open it Copy and paste the youtube link in the case in vdownloader (at the top on the left) but before downloading don't forget to choose original data (at the top on the right)
And here you have your fragmovie.
BTW I watched the video and they played against low or?!