Don't know the details of Google's setup, but they're creating a screencast with a tablet. There are several ways to do that depending on your hardware, but if you search for 'creating screencast with tablet' you'll find several examples.
Thanks, but I've been through that without a solid answer. It appears they're doing a standard desktop screencast then running it through a stylus-based app to write on top of the video.
Would have been nice to hear from anyone who's familiar with this.
Wow, did this post ever land at an opportune time for me. I just started writing a 'first' blog post about my Hugo static site generator setup and stopped half way through with the thought, "why would anyone care about this, it's trivial and almost condescending to tell people how to set up Hugo".