https://www.youtube.com/watch?v=yWQq-hdgg8s
Video Updated
Since the google toolbox for hangouts seems to have gone the way of the Dodo. I have put together this quick rough video on how to use OBS to get your Lower 3rd back and also add other graphical elements to your Hangout camera.
there are a few steps. I may re-record this later if I can find some time to do a bit more production value on it. but the basics of using OBS to do Lower 3rd in Hangouts is here.
NOTE this really will only help Windows users. if your on Mac or Linux you will need to hunt down a different Virtual Camera Output plugin for OBS..