What cam are you using now? Camgirl sites seem to recommend the Logitech range, mainly Logitech Pro 9000 and Logitech C920 HD Pro Webcam Widescreen1080p Video.
I have a Logitech Pro 9000, it has a video effects package, I have never downloaded the software, but it may do what you are looking for. Try going to a forum such as
http://www.wecamgirls.com and ask questions there, someone should know what you are talking about.