I am perfect for this project because I have been using Camtasia (on Windows and Mac) for over 2 years. For over a year now, and as my job, I have been making software videos inside of Camtasia. I can sync and edit your videos quickly and efficiently and send you the finished file within hours. I watched the video you linked to, and your project makes perfect sense to me.
If you have any questions or want to get started working, feel free to message me!
Thanks,
Nate Lovell