[Bug 724705] videomixer: Port to new collectpads API

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=724705
  GStreamer | gst-plugins-good | git

Bug 724705 depends on bug 726461, which changed state.

Bug 726461 Summary: collectpads: should send the seek events to the peers of its sink pads, as they can be flushing
https://bugzilla.gnome.org/show_bug.cgi?id=726461

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |FIXED

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