Run rsync daemon with the following config
[some_string] path = /home/client/videos.domain.com comment = videos list = false secrets file = /etc/rsyncd/rsyncd.secret auth users = some_user
(some_string - any string appropriate for you , it will be used in rsync-URL, see below)
Add the following record to the /etc/rsyncd/rsyncd.secret
some_user:some_password
(change some_user and some_password to some values, you can use random password and login)
Change permissions to 600 on /etc/rsyncd/rsyncd.secret (chmod 600 /etc/rsyncd/rsyncd.secret)
Provide CDN-support with some_user:some_password values and rsync-URL
rsync://yourhost.example.com/some_string/
or
rsync://<IP>/some_string/
<IP> - IP address of your host