[Bug 784599] kmssink: support videooverlay interface

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784599

--- Comment #84 from Wonchul Lee <chul0812 at gmail.com> ---
Created attachment 363659
  --> https://bugzilla.gnome.org/attachment.cgi?id=363659&action=edit
kmssink: support videooverlay interface (version 7)

I attached a patch which is based on Haihua's work because I just wanted to
make it adapted to upstream quickly.
I've fixed to update the render_rect when the rectangle size isn't changed,
only the position (x,y) changed, it will not renegotiate which doesn't affect
in this case and just updated final render_rect, also fixed some simple things
mentioned earlier.

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