We are using SIP/PBX setup (Kamailio-Freeswitch) with Kazoo. We need to create a User page where 2 or more people can have video conference with least settings.
Currently Phone and Fax is working. I think video work on certain apps.
I recommend you to install the videoconference on another machine (quad core). I have Verto Communicator (with freeswitch) and i provide pre-built videoconference ISO images.