Mpmovieplayerviewcontroller support Landscape.

In the application Delegate file.

-(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{

    if ([NSStringFromClass([[self.window.rootViewController presentedViewController] class]) isEqualToString:@"MPInlineVideoFullscreenViewController"]&&[self.window.rootViewController presentedViewController].isBeingDismissed)
    {
        return UIInterfaceOrientationMaskPortrait;
    }
    if ([NSStringFromClass([[self.window.rootViewController presentedViewController] class]) isEqualToString:@"MPInlineVideoFullscreenViewController"])
        return UIInterfaceOrientationMaskAll;
    else
        return UIInterfaceOrientationMaskPortrait;

}