[Bug 773709] player: Add get video thumbnail API

[GStreamer (GNOME Bugzilla)]

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

--- Comment #10 from Lyon <lyon.wang at nxp.com> ---
The original thought of adding this thumbnail API is coming from get the
thumbnail for video preview before open it to play (and add the seek position
is because usually at the beginning of the film, there will be all black frames
for several seconds ).

It is kind like media info for the video stream, but then I find it is not very
proper to add this API in the media-info interface, as it is not the
information got from media information data.
So I add this API at gstplayer API 


The reason I use structure is that for setting type/width/height/par_n/par_d,
there seems too many parameter for the function.

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