I think the simple answer to your question is that you'll need a 2D Video Editing application like: Adobe Premiere, Ulead Video Studio, or some other application. If you look you may find a freebie at tucows.com or download.com or something. With this you can splice the video output(probably.avi or .mpg) of Carrara with your home videos. You home video footage will also probably be in .avi or .mpg format once it is loaded into your computer. The hardware you use to acquire the data from your camcorder and into your computer probably came with such a 2D editing application. Video cards from ATI come with Ulead Video Studio...