[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 #1 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 367248
  --> https://bugzilla.gnome.org/attachment.cgi?id=367248&action=edit
video-overlay: Add helpers for render rect properties

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

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