[Bug 768248] vaapiencode: Add Encoding region-of-interest (ROI) support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768248

--- Comment #31 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 348980
  --> https://bugzilla.gnome.org/attachment.cgi?id=348980&action=edit
tests: elements: add an example for roi

This implements a pipleint to recognize difference between ROI and non-ROI.
See comments in this code in detail.

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