[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 #11 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 367333
  --> https://bugzilla.gnome.org/attachment.cgi?id=367333&action=edit
video-overlay: Add helpers for render-rect property

This is a set of helper that makes it easy to enable the render
rectangle to be controllable through a property.

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