as pointed by Reetp you need to search it for centos 7 and will find all how tos you need and they all point to nginx because apache httpd does not have the module to do that.
so you yave to install nginx configure it according to the how to then, add a config entry as service to allow it to start on reboot. Nginx only need to listen localhost
then you will need to reverse proxy the output of nginx trough the SME apache httpd service
but also as pointed by Reetp this is xy problem and your real issue is not having rtmp ising hls but ability to stream video content, so as your other question red5 might be an option, and if you were asking really your real problem you might find an even easier solution.