I'm sorry, the problem is solved.
My task was to block access from url http://server_ip_address:nimble_port/server_name/channel/playlist.m3u8 to all users, instead that url they get another, wich listens by nginx.
I did not understood, that Nimble listen all interfaces on my server, including localhost (lo).
So i can REJECT access to http://server_ip_address:nimble_port in IPTABLES and use NGINX to proxy url that i give to users to http://127.0.0.1:nimble_port/server_name/channel/playlist.m3u8.
But i have another problem now!
I'm using HLS protocol for output and the sound of my channels is stutters all time. Can i do something with it?
Or i need to start a new topic?