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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #16 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
So, I think this is less hacky then before, let me know if there is anything
that would prevent this from going upstream. What's left is to re-read the doc,
I can see couple of typos and an missing something in the main GstVideoOverlay
description.

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