1) make sure you placed them in either /www or /public_ftp
2) if it's in /www.... well let's say it's in /www/hello/world.avi and your domain is in abc.x10hosting.com the location of the video would be in http://abc.x10hosting.com/hello/world.avi
if it's in /public_ftp, then just provide an anonymous ftp access to your site ftp