If you ever need to record a video of an app on your screen in Windows 10, the built-in Xbox app has a recording tool that may fit the bill.
The Xbox app comes already installed in Windows 10. One of its features is a video recorder tool intended to let you capture in game videos. It turns out the tool will work with just about any app. It won't capture your entire desktop, so if that's what you're looking for you'll need to turn to a more powerful screen casting app. But if you just need to record a specific app, give it a try.
If you haven't already, you'll need to run the Xbox app for the first time. After that, you can press Windows+G to open the Game Bar overlay, which includes tools for capturing an image or video of an app window. The first time you launch game bar for each app, you'll get a message asking whether it's a game. Just tell it yes and start recording. Captured videos are saved in the MP4 format in Videos/Captures.
How to Use the Hidden Screen Recorder Tool in Windows 10 [WonderHowTo]