[Bug 792798] video-overlay: Add helper to make render rectangle controllable with properties

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792798

--- Comment #12 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 367334
  --> https://bugzilla.gnome.org/attachment.cgi?id=367334&action=edit
xvimagesink: Allow changing render-rect through property

This also enables setting the render rectangle before the window
is provided or created.

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