[Bug 702722] opencv: add GrabCut segmentation element

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=702722
  GStreamer | gst-plugins-bad | 1.x

--- Comment #12 from Miguel (elmiguelao) Casas-Sanchez <miguelecasassanchez at gmail.com> 2013-07-11 15:22:02 UTC ---
I re implemented as GstMeta, that needed two extra files: gstboundingbox.{h,c}.
Tried with crop but videosink reacted to that, hence the new stuff.

Since there would be an add_bounding_box_meta per detected face, all would be
passed downstream while gstgrabcut only collects the first one (largest by
implementation).

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