ios - CAScrollLayer not working on Video -

i trying create image animation on video of cascrolllayer able add images on cascrolllayer it's not scrolling when video played appreciable below code have tried far.

   calayer *layer;     // self.view = [[uiview alloc] initwithframe:cgrectmake(0, 0, 320, 460)];    scrolllayer = [cascrolllayer layer];    scrolllayer.backgroundcolor =  [[uicolor blackcolor] cgcolor];    scrolllayer.bounds = parentlayer.bounds;    scrolllayer.contentsrect = cgrectmake(0, 0, scrolllayer.bounds.size.width*images.count, scrolllayer.bounds.size.height);    scrolllayer.borderwidth = 2.5;    scrolllayer.bordercolor = [[uicolor redcolor] cgcolor];    scrolllayer.position = cgpointmake(self.view.center.x, self.view.center.y - 20);    scrolllayer.scrollmode = kcascrollhorizontally;    scrolllayer.speed = 2.0;    //  [self.view.layer addsublayer:scrolllayer];     [parentlayer insertsublayer:scrolllayer atindex:0];     for(int i=0; i<[images count]; i++) {       uiimage *image = [images objectatindex:i];       layer = [calayer layer];       layer.backgroundcolor = [[uicolor blackcolor] cgcolor];       layer.bounds = cgrectmake(0, 0, 300, 300);       layer.contents = (id)[image cgimage];       layer.position = cgpointmake(layer.bounds.size.width * i, self.view.center.y);        // scrolllayer.speed = 2.0;        [scrolllayer addsublayer:layer];    }     [parentlayer addsublayer:scrolllayer];    [self performselector:@selector(scrollpoint) withobject:nil   afterdelay:2.0];    compostion.animationtool = [avvideocompositioncoreanimationtool videocompositioncoreanimationtoolwithpostprocessingasvideolayer:videolayer inlayer:parentlayer]; 

thank you.