My previous tutorial showed how to use a free software called WAX to add chroma key (green screen effects) to your movie. WAX, however, had many problems. People we're complaining that this and that didn't work, something screwed up, etc.
So I looked for a better and free video editing software, and found T@B ZS4 (download it at the downloads section of the site). I was amazed at how great the program was. The input/output compatibility was large, it had several more features than WAX, and definable output quality.
But the best part is, it's got a higher quality Chroma Key plugin! And, also, a Key Smoother plugin to make your video look real professional in quality!
You don't need to be a computer nerd (... like me...) to use this program, just follow the video tutorial.