I need to do a video capture of just a running application window, not the entire desktop.
Similar to the Nvidia Games Bar functionality in Windows. Is there a 3rd party app that will do this in Ubuntu?
VokoscreenNG offers an option to record a window:
You can install it as a snap package by running the following command in Terminal
snap install vokoscreen-ng
You can also install it with apt
on Ubuntu 20.04 and later from the universe repo by running
sudo apt install vokoscreen-ng