[Bug 789467] videoencoder: add qos property

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789467

--- Comment #3 from Guillaume Desmottes <gdesmott at gnome.org> ---
I implemented it as in gstbasesink. I don't mind changing if it's considered as
a better pattern.

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