I’m stealing this tech how to from the folks at CNet. So, rather than me tell you how to do it, why don’t you increase their site visits and check this out. While I like using Google+ for Hangouts, I suspect you could have some fun with the app, especially if you needed some security.
Of course, you could always just connect to Skype, Google+, or any other video conference software with their Android app. But hey, that isn’t really “hacking,” is it?