Holacracy pioneer Brian Robertson gave a talk at Google in New York city, where he was invited to present the core principles, structure, and practices used in Holacracy.
The talk features a 28-minute presentation of Holacracy + two Q&A sessions (the best part!).
See http://www.holacracy.org/intro for this information with the video`
It also says:
Once you finish watching this recording, you may also be interested in learning about the Holacracy governance meeting (also includes a simulation video).