I didn't even THINK of that.
There are various options, and a lot depends on how much you want to do with it.
Personally I won't do the full screen capture because I want access to the controls of AHFV while I screen capture. I run AHFV maximized, but not full screen and use a specific size rectangle to capture the window.
I tried the Nvidia thing,... just wasn't fitting my style of doing things. If you're doing a straight in straight out video it's probably fine.
Bandicam has a setting to use Nvidia processing, which is what I use, combined with the Lagarith codec. It really depends on codecs available on your computer.
You'll get a different answer from anyone you talk to, everyone has found their owns ways that fit them best. I was just mentioning something to get yas kick-started. End result is, you're going to use a screen capture app. Some work straight out of the box and some need tweaking to get that clarity.