My application includes a video to be viewed in landscape mode, I applied the following code:
- (IBAction)videoAction:(id)sender {
    NSString *path = [[NSBundle mainBundle] pathForResource:@"MTLowRes" ofType:@"mp4"];
    MPMoviePlayerViewController *moviePlayer = [[MPMoviePlayerViewController alloc]initWithContentURL:[NSURL fileURLWithPath:path]];
    [self presentModalViewController:moviePlayer animated:NO];
}
Code for managing landscape orientation in AppDelegate.m is as follows:
- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)windowx
    {
        if ([[self.window.rootViewController presentedViewController] isKindOfClass:[MPMoviePlayerViewController class]] ||
            [[self.window.rootViewController presentedViewController] isKindOfClass:NSClassFromString(@"MPInlineVideoFullscreenViewController")])
        {
            if ([self.window.rootViewController presentedViewController].isBeingDismissed)
            {
                return UIInterfaceOrientationMaskPortrait;
            }
            else
            {
                return UIInterfaceOrientationMaskAllButUpsideDown;
            }
        }
        else
        {
            return UIInterfaceOrientationMaskPortrait;
        }
    }
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    if ([[self.window.rootViewController presentedViewController] isKindOfClass:[MPMoviePlayerViewController class]] ||
        [[self.window.rootViewController presentedViewController] isKindOfClass:NSClassFromString(@"MPInlineVideoFullscreenViewController")])
    {
       return UIInterfaceOrientationLandscapeLeft;
    }
    else
    {
        return UIInterfaceOrientationPortrait;
    }
}
This works fine, but the video is not rotating to full screen when I select the option to view full screen.
I tried applying the same code on another View Controller, where video works fine in landscape full screen mode.The only issue is with the current view controller.
 
    