No, not like video chat on your email. But of you have the iPod Touch 4th generation you can use FaceTime, which is pretty much video chatting but the other person must have an iPhone 4, the 4th gen...
First you have to make an account. Then you need to add contacts to your list and add the information about them. Then you need to click on the contact and start your video chat.
Depends on what you are on. If you are on Gmail You must first download voice and video chat which can be done when chatting with a friend. If you are on Skype call someone's Skype number. I don't...