With Camtasia, I suspect that you would still need a virtual audio cable. Maybe not VM Banana, just VB-Cable.
Techsmith is a great company. I've used SnagIt since Win95 (I knew one of the original developers). I have used Camtasia in the past. But it's $300. That's why I didn't mention it. Action! is $30, and I donated $20 for VM Banana, and you can try them both for free.