Currently when you do a quick install of jitsi-meet for the first time
it will configure jitsi-videobridge to serve meet. Its embedded jetty
will bind to port 443 (authbind configured to allow using port < 1024)
and use it for https and tcp media relay connections.
Already installed and configured to use nginx will not be touched.
If you face some trouble please let me know so we can take a look.