This helper shall be used by classes implementing the GstVideo.VideoOverlay
interface that want the render rectangle to be controllable using
properties. This helper will parse and set the render rectangle calling
gst_video_overlay_set_render_rectangle().
This helper shall be used by classes implementing the GstVideo.VideoOverlay interface that want the render rectangle to be controllable using properties. This helper will parse and set the render rectangle calling
gst_video_overlay_set_render_rectangle().