WKWebView video playback change notification

video_listener.m

// Listen for video playback
[[NSNotificationCenter defaultCenter] addObserver:self 
  selector:@selector(videoPlayingDidChange:) 
  name:@"SomeClientPlayingDidChange" 
  object:nil];

// Video playing state handler
- (void)videoPlayingDidChange:(NSNotification *)notification
{
  BOOL isPlaying = [notification.userInfo[@"IsPlaying"] boolValue];
  // Do stuff with this newfound knowledge
}

So how would one go about playing an embedded video like YouTube in their WKWebView? When launching an embedded YouTube video from a UIWebView, it plays just fine – whereas in the WKWebView it automatically plays in fullscreen.