Hi Sivash,
From my point of view the video player should actually be RTL'ed. I'm an Arabic user and I'm used to see everything from Right-to-left.
However, since physical video and cassette recorders have all been manufactured LTR this can be an exception. Youtube still maintain the same UI's for both direction, but all of the mentioned doesn't make it correct.
I still think that it should be RTL'ed, because everything else is!
Thanks,