Unable to capture screen with VLC on Ubuntu+KDE 17.10

The already mentioned vlc-plugin-access can also be installed using the command line:

sudo apt install vlc-plugin-access-extra

You need to get vlc-plugin-access-extra from https://launchpad.net/ubuntu/bionic/+package/vlc-plugin-access-extra. Source: https://itsfoss.com/vlc-pro-tricks-linux/.
I'm running Kubuntu 17.10 & Plasma 5.12.4. I have an Nvidia card, which apparently doesn't play well with Wayland so I'm running X11. First test is not perfect, but it was graphic intensive. It needs a little tweaking, but at least it didn't fail.