Links the two named pads of the source and destination elements. Side effect is that if one of the pads has no parent, it becomes a child of the parent of the other element. If they have different parents, the link fails.
the name of the gstreamer.Pad in source element or NULL for any pad.
the gstreamer.Element containing the destination pad.
the name of the gstreamer.Pad in destination element, or NULL for any pad.
TRUE if the pads could be linked, FALSE otherwise.