[Bug 797230] video-overlay-composition: Handle miniobject writability correctly

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797230

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 373815
  --> https://bugzilla.gnome.org/attachment.cgi?id=373815&action=edit
video-overlay-composition: Handle miniobject writability correctly

By tracking parents and using the proper GstMiniObject API for detecting
writability instead of just the reference count.

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