Touchscreen is not working. What can I do?

Thanks in advance

http://www.youtube.com/watch?v=WCQi52Bv2dk

this is the problem

pls guys any help... can u at least tell me which parts do I need to replace... I don`t wanna buy extra parts if I don`t need them

I have seen your video in youtube. From how many days your problem is happening? I think there must be some serious hardware problem. You should take it to a apple store. They will replace the screen for $199.