MindMeister for Google Hangouts

Unfortunately, MindMeister's Hangouts integration was discontinued.

However, if you are interested in live streaming on a mind map, you can use the YouTube streaming option: https://support.google.com/youtube/answer/2853700?hl=en

To add live streaming to your mind map, just copy the URL of the YouTube live stream, and paste it on any topic in a mind map to embed it.