Want to show video clip of 10 mins and open a pdf document inside a game..Is it possible in unity pro ???

Not out of the box, no. But what you're describing is a combination of like 3 or 4 t$$anonymous$$ngs. :) Some of it IS possible. Playing a video is possible using a so called Movie Texture, w$$anonymous$$ch is kind of like a RenderTexture, except that its frames come from a video clip, and not a camera. It's a Pro only feature, you can read about it here:

http://unity3d.com/support/documentation/Manual/Video%20Files

Reading and displaying PDF files is not supported directly in Unity, however. T$$anonymous$$s seems natural enough, since PDF reading is sort of an Office/Work station related task, and Unity is a game engine. :)

There are plenty of PDF libraries available just for .Net, however, so maybe you can find one that imports your PDF and exposes the data somehow, and then insert that data into Unity GUI controls you create yourself to display it?