you know iPod can only play mp4 or h.264? you can try to convert the DVD movie into mp4 or h.264. try to use leawo free dvd to ipod converter, it must can help you. i am using it for my iTouch too. it is free with no watermark. and it is easy to use. you can free download it form the pages-------------------
For Windows: http://www.google.com/search?hl=en&newwindow=1&q=site%3Aleawo.com+dvd+to+ipod&btnG=Search&aq=f&aqi=&oq=
For MAC: http://search.yahoo.com/search;_ylt=A0oGkmZFTJxL.MYAdHFXNyoA?p=www.leawo.com%2Fmac-dvd-to-ipod-converter%2F&fr2=sb-top&fr=yfp-t-701&fp_ip=cn&rd=r1&meta=vc%3Dcn&sao=1 here are some simple steps:
1, open the program and put your DVD into ur computer
2, click load DVD, find the DVD movie.
3, setting. choose mp4 as out put format.
4, click start then wait till the process finished
5, you can drag and drop the mp4 file into the iTunes, then sync it into the iPod. Or you can copy your mp4 files into the video folder on your iPod too. i think this detailed guides may help you too.
dvd to ipod for win: http://www.google.com/search?hl=en&newwindow=1&q=%22Put+DVD+Movies+on+My+iPod+with+Leawo+DVD+to+iPod%22&btnG=Search&aq=f&aqi=&oq=
dvd to ipod for mac: http://www.leawo.com/dvd-ripper-mac/user-guide.html