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

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 792798
           Summary: video-overlay: Add helper to make render rectangle
                    controllable with properties
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This is an attempt to make it easy to turn the GstVideoOverlay into properties.
This was implemented in order to ease manual testing of the overlay rectangle
feature. These helper are demonstrated through an xvimagesink implementation.
As shown, changing the rectangle is made atomic by using
dispatch_properties_changed virtual method of GObject class.

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