Can I place one method inside of another method in iOS

-(void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error{}

All the code inside the above method is programmatically added in app. Everything added in my -(void)GameOver method is added through Xcode's Storyboard.

I want to place the code in the -(void)bannerView method inside my -(void)GameOver method. How would i do this?