I'm not really sure what your asking for. But:
If you want to Rip a DVD that you own onto your iPod, use this guide:
http://www.ipodtouchforum.com/genera...pod-touch.html
If you want to Convert a DVD that you have on your Computer to put on your iPod, then in that guide in the link I gave you above, Skip steps 1, 3, 4, and 5, and just use the converter.
If you want to add a converted movie to your iTunes Library, it has to be in a certain format, MP4. To add a file to your library, drag the original video file from a place (Preferably your desktop) into the Movies section of your iTunes Library.
(Note: If the video is not in the right format, iTunes will not accept the video. Therefore, it will not be added to your library.)
Hope this helps!
