Hi...
You see, the technique to replace the green screen is something that many programs do, however the level of results depend on the power of the software that you are using. Camtasia is a simple editor that provides limited tools for video editing, but if you're looking for a professional result then you need professional software as Adobe After Effects or Adobe Premiere Pro. I do not know if you already considered this but I could be your video editor and we could create a fixed price for edited videos. I have over 8 years experience in Adobe After Effects, Sony Vegas Pro and Photoshop, professional software. I offer you good quality and fair price.
Please compare the completion rate and average rating. (My completion rate is 100% and my average rating 5 Stars).