Dismissing fullscreen movie player from <video> tag in UIWebView with animation and completion handler

SomeWebViewController.m

/*
 WARNING: PRIVATE API CALLS
 WARNING: FORCEFUL MEMORY MANAGEMENT
 highly recommend to avoid using this code
 */
- (void)exitFullScreenVideo:(BOOL)animated completion:(void (^)(void))completion
{
    /*
     iOS 6~7の場合
     本ViewControllerの上にMPInlineVideoFullscreenViewControllerがfullscreen modalで表示されるような挙動になるので
     それを通常通り閉じてやればよい
     
     iOS 8の場合
     新しいUIWindowが生成され、生成されたUIWindowのrootViewController.presentedViewControllerがAVFullScreenViewControllerになる
     まずAVFullScreenViewControllerを閉じて、それからUIWindowのrootViewControllerをnilにセットしてhiddenにすることでUIWindowを消す
     */
    if ([[[UIDevice currentDevice] systemVersion] doubleValue] >= 8.0) {
        BOOL isFullScreenVideoContent = NO;
        for (UIWindow *window in [UIApplication sharedApplication].windows) {
            if ([window.rootViewController.presentedViewController isKindOfClass:NSClassFromString(@"AVFullScreenViewController")]) {
                [window.rootViewController dismissViewControllerAnimated:animated completion:^{
                    window.rootViewController = nil;
                    window.hidden = YES;
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
                    [window performSelector:NSSelectorFromString(@"release")];
#pragma clang diagnostic pop
                    completion();
                }];
                isFullScreenVideoContent = YES;
                break;
            }
        }
        if (!isFullScreenVideoContent) {
            completion();
        }
    } else {
        if ([self.visibleViewController isKindOfClass:NSClassFromString(@"MPInlineVideoFullscreenViewController")]) {
            [self dismissViewControllerAnimated:animated completion:completion];
        } else {
            completion();
        }
    }
}

Thanks! works like a charm!