I have found one free video chatroom program but it's just bulit up for your PC (you can invite your outside friends for playing ), and I guess and hope many proficient here can modify it adapt for virtual host or moodle, who knows.
Download http://www.zlsoftcn.com/products.html
Demo: http://www.zlsoftcn.com/demo/meeting/index.php
用户名：letmetry
密码：letmetry