[Bug 759329] convertframe: Support video crop when convert frame

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759329

--- Comment #13 from kevin <kevinbing.song at gmail.com> ---
The video buffer which has CROP meta is get from video sink. The video sink can
handle CROP meta. Thumbnail function will get the last-buffer from the video
sink and convert it to user's desired format. So we should consider the CROP
meta to get right thumbnail.

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