The first, shorter video tutorial was authored by Tom Krcha of Adobe and guides you through building a simple P2P application leveraging Stratus. Watch it here.

The second presentation is an hour long session by Danny Patterson and goes into more depth than the previous tutorial. I haven't watched it in full but the part that I have seen looked very interesting and I definitely recommend you check it out.

It should be noted that Stratus is still in beta and detecting failed P2P connections can be a quite tricky. I would not recommend the P2P features for production use yet, instead you may want to rely on AFCS to handle the RTMP fallover for you.