It’s available as part of the Stream Delivery service Cloudflare Stream Delivery | Streaming Video CDN for Enterprise customers. If you’re interested in pricing/implementation details I’d recommend connecting with the sales team to discuss your use case(s).
So, this doesn’t look to be answered. concurrent streaming is a great feature, but doesn’t seem to answer the “how to” do a live stream.
I have the same question, as I am trying to do a 24/7 live webcam stream with hopes to have Cloudflare act as CDN. So far, nothing answers the question of how to achieve this.