[Bug 773660] decklinkvideosink: Add support for hardware keying

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773660

--- Comment #14 from Dave <dave at digits.tv> ---
Created attachment 357582
  --> https://bugzilla.gnome.org/attachment.cgi?id=357582&action=edit
Further revised patch to enable the Decklink hardware keyer.

This patch now checks the keyer interface exists before using it.

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