If you cant find anything, you can go to this useful site 
http://www.irc.gmu.edu/resources/findingaid/camtasia/camtasia.htm
It has a lot of info you can use, just resize the window, and place it over the wbcam...hope it works
quote:
Originally posted by Areus
(would it be an invasion of privacy to  record it?)
not exactly an invasion of privacy, but it would be weird...i personally wouldnt like to be recorded 

 its kinda freaky 

 You should ask them if they wanna be recorded first or not.