dialog displaying problem

Dear all:
Is that possible to display a dialog or draggable object on the top
of the video files(mov,avi,...) played by Quicktime/ Widows Media
Player..?
I've tried something like below, but the dialog still display under
the video player!
$("#dialog").dialog({
modal: true,
overlay: {
opacity: 0.5,
background: "black"
}
});
Regards,
Kaie