Which iPod do you have and which version of the software is it running? What model is your tv? How is the dock connected to the tv (HDMI, composite, component, etc.)? A few more details from you might get us closer to helping you troubleshoot your issue.
I have a iPhone 4 running the latest iOS. My iPod dock is connected to my onkyo receiver, it came with the receiver. The receiver Is connected with hdmi to the tv. Tv is sharp 732u, I used to be able to see video from iPhone to the tv, so I know it can be done. Thanks for helping.