[Bug 773709] gstplayer: Add get video thumbnail API

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from Lyon <lyon.wang at nxp.com> ---
Created attachment 338806
  --> https://bugzilla.gnome.org/attachment.cgi?id=338806&action=edit
patch for add get video thumbnail API

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