Creates a new video overlay composition object to hold one or more overlay rectangles.
Note that since 1.20 this allows to pass null for rectangle.
a #GstVideoOverlayRectangle to add to the composition
a new #GstVideoOverlayComposition. Unref with gst_video_overlay_composition_unref() when no longer needed.
Creates a new video overlay composition object to hold one or more overlay rectangles.
Note that since 1.20 this allows to pass null for rectangle.