try this instead, place a simple landing page in that little window and tell them the video needs a codec in order to play it with a "get codec" button
rip a codec page from somewhere and make sure it loks professional.
link your "get codec" button to your fake codec page
pop your locker over the codec page with a short message saying something like "get acess to this premium codec now"
I know people doing this and it works nicely