I make video playback application upon the VideoPLayback sample of Vuforia. I must do some operations after video completed. Because of this I stop the AR and OpenGL operations and move to the new view controller. For example after video on the detected texture completed I stop the AR and go back to the root view controller. I repeat this operation many times. After the each operation 7-8 mb memory cannot be deallocated and gradually memory increases. I destroy all allocated objects and OpenGL resources but it does not effect.