[Bug 790999] only vaapisink should query for app context

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790999

--- Comment #1 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 364635
  --> https://bugzilla.gnome.org/attachment.cgi?id=364635&action=edit
videocontext: only vaapisink queries for app context

App context is made for applications that will provide, via
GstContext, the VA display and the native display to use by the
pipeline, when are using vaapisink as overlay. There ir no use case
for encoders, decoders, neither for the postprocessor.

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