Facetime with Google Chat

On GMail you have the capability to open a video chat while in a chat with someone online. I know that facetime operates off the same principal of contacting you through your e-mail address and I was wondering if it was possible to use facetime (or some other application I am not aware of) to utilize google chats video capabilities. I know you can download a "facetime app" for macbook or PC, but I would like to be able to initiate a video chat via my iPad with people who are using Gmail chat.