Did you ever wonder how easy is it is even for elder people (say Your Granny) to use Video Chat using GMail? Yes, it is damn simple. Google now has a video to prove that, and of course a PDF guide for the same.
Here is the direct link to the Tutorial Video which even your Grandma can use 🙂 youtube.com/watch?v=CDvgjV54wIg. And you can download the PDF booklet from this link.