Kazam is a very simple screen recorder for KDE but just because it is simple doesn’t mean it isn’t really good at it’s job. Kazam provides a well designed and easy to use interface for capturing screen‐casts and screenshots. It can record desktop video and multiple audio streams simultaneously with control over audio levels and the screen region being captured.
To install Kazam on KDE neon or Kubuntu 18.04, open Konsole and type,
sudo apt install kazam
After installation, Kazam can be found in the Application Menu under Applications/Multimedia or by typing Kazam into the search box at the top of the menu.
I tend to use the videos I take with Kazam on the web so I usually convert them from the default mp4 to webm with a command like,
ffmpeg -i kazam.mp4 kazam.webm