[Bug 773709] player: Add get video thumbnail API

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773709

--- Comment #5 from Lyon <lyon.wang at nxp.com> ---
Created attachment 339098
  --> https://bugzilla.gnome.org/attachment.cgi?id=339098&action=edit
Updated patch

patch updated:
- Add parameter width and height
- remove enum RGB and add xRGB and BGRx
- if width and height is valid, then set width/height caps to convert

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