Updated the camerabin2 based camera with QtMultimedia changes

Moved it to the separate plugin as the rest of gstreamer based services;
Updated with libqgsttools_p changes;
Implemented QMediaRecorder::status property;
Made gst_photography dependency optional,
it's not always available on desktop;
Added video recording case to auto integration test;
Moved backend implementation into qt namespace

Task-number: QTBUG-26046
Change-Id: Iacfc1a6e263a4c0201d5eb28d04c960b87a230c0
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

src/plugins/gstreamer/camerabin/camerabinfocus.cpp

@@ -51,6 +51,8 @@
 #define ZOOM_PROPERTY "zoom"
 #define MAX_ZOOM_PROPERTY "max-zoom"
 
+QT_BEGIN_NAMESPACE
+
 CameraBinFocus::CameraBinFocus(CameraBinSession *session)
     :QCameraFocusControl(session),
      m_session(session),
@@ -223,3 +225,5 @@ void CameraBinFocus::_q_stopFocusing()
     gst_photography_set_autofocus(m_session->photography(), FALSE);
     _q_setFocusStatus(QCamera::Unlocked, QCamera::UserRequest);
 }
+
+QT_END_NAMESPACE