Added what should be enough documentation for people to spin up their own zap-stream-core: https://github.com/v0l/zap-stream-core/blob/main/README.md#deploying
If something is missing let me know.
A...
Looking into this, first thing that comes to mind it that Cloudflare tunnel probably isn't a good way to proxy a stream out from a home node. It's meant for light web pages and using it to stream video is against TOS, AFAIK.