[Bug 775377] opencv: cvlaplace/cvsobel/edgedetect should use the already mapped outimage

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775377

--- Comment #6 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 341199
  --> https://bugzilla.gnome.org/attachment.cgi?id=341199&action=edit
edgedetect: Avoid extra copy of the output image

Simply produce the result into the output image provided by the base
class. This avoid useless copy. This also removes unchecked buffer map
and ensure that GstVideoMeta is respected (for stride mostly).

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