Qt/KDE camera app alternative to Cheese in Kubuntu 18.04?
According to the description in apt show kamoso, it's a "tool to take pictures and videos from your webcam".
If you want to read about it before installing, the man page for 18.04 is here: http://manpages.ubuntu.com/manpages/bionic/en/man1/kamoso.1.html.
There's also https://userbase.kde.org/Kamoso and https://github.com/KDE/kamoso/
sudo apt install kamoso