for short i'am System Engineer and do not write code. Play with joomla for fun.
When you have the two needed machines up and running the installation of the com_videowhisper is easy as described on www.videowhisper.com.
Pay attention in creating the Menu entry with your on external URL to LAMP.
LAMP on ubuntu 8.04.3 and Red5 on ubuntu 9.04 with an exellent "how to" found with "red5 up and running" in a search engine ;-).
I guess Red5 could be a killer for newbee's. The describtion from videowhisper is a bit out dated.
So fact: THIS PRODUCT IS AWESOME.
Play with it and have fun. Oh, be the way, i do not have any contact to videowhisper ;-).
A happy joomla user.