A serious problem with video display

hello all,
i have used SDL and Qt for video display. i have got a
serious problem now.
in my application, i have got a main window and a
child dialog. i want to display video on both of them
at the same time, i.e. i run the main window i display
one video, then i click a button in the main window to
run the dialog and display another video while the
other video in the main window is still playing.

the main window display is fine, but when i run the
dialog the video is played behind the dialog and it is
flashing.

Is it actually possible to this with SDL and Qt?

If yes, how can i solve my problem, or how can i get
the display on my dialog not behind it!!?

If no, is there any other alternatives that you can
suggest?

thanks in advance for any help.

Regards________________________________________________________________________
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