abfbcc0b6f
Ideally new() functions should simply call g_object_new() and not much else, so let's do that here and handle all the construction properly in a GObject way. Now a player object created via g_object_new() is actually usable. In addition, also fix the video-renderer property so that reading it returns an object of the correct type. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2880>