[Bug 764673] New: blacklist non-supported backend drivers

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764673

            Bug ID: 764673
           Summary: blacklist non-supported backend drivers
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vjaquez at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

There are a lot of complains from users who try gstreamer-vaapi using
unsupported/non-intel vaapi backends. 

We need to detect what backend is using the client and then we have two
options:

1\ show a flashy warning that they are using an unsupported backend and some
use case might not work at all.
2\ directly bail out the vaapi element and let the autoplug to choose another
element.

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