set_window_handle on vaapisink

// video.sink is a vaapisink, video.x11_window is glXGetCurrentDrawable()
video.video_overlay = GST_VIDEO_OVERLAY (video.sink);
gst_video_overlay_set_window_handle (video.video_overlay,
      (guintptr) video.x11_window);


Program exits with XLib error:
X Error of failed request:  BadAccess (attempt to access private resource denied)
  Major opcode of failed request:  2 (X_ChangeWindowAttributes)
  Serial number of failed request:  21
  Current serial number in output stream:  21