How to add nginx module which is not by default

[eris]

Secure link is enabled by default works fine on my server (All default)

	location ~* ^.+\.(mp4|webm|mp3|ogg|ogv)$ {
     proxy_cache    off;
         secure_link $arg_md5,$arg_expires;
         secure_link_md5 "$secure_link_expires$uri %user%";
         if ($secure_link = "") {
            return 403; 
         }
         if ($secure_link = "0") {
            return 403; 
         }
     root           %sdocroot%;
         access_log     /var/log/%web_system%/domains/%domain%.log combined;
         access_log     /var/log/%web_system%/domains/%domain%.bytes bytes;
    }