QGraphicsVideoItem was not working because the QPainterVideoSurface was
unable to paint BGR32 format OpenGL textures. Now if the QGraphicsView
window has a QGLWidget viewport, we use the GLTextureHandle to render
the video, otherwise we fallback to the software QImage rendered case.
Task-number: QTBUG-28017
Change-Id: I9304e0a2536f15075ae34cdd509ef24fbc18604e
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>