Actually i want to display youtube videos in my site in category wise and i want to display google adsense in it. Is there any opensource in which we can search youtube videos and it will display adsense in it?
You can try open source script like phpmotion. I think you can also pull youtube videos into it. Do you want to just use youtube videos or also let users upload videos on your site ??
What do you mean by "displaying adsense in it". Do you need ads inside the video or near the placeholder of the video? If you want to integrate youtube capabilities in your site use the youtube API directly http://code.google.com/apis/youtube/overview.html. With that you can do everything you ever need and more! Google adsense also has the possibility to display videos with ads. Check video ad units in your Adsense account