Failed to start cannot create videosrc and cannot find videoflip

[Casper van Elteren]

For posterity, if you have the following error:

Caused by:
    0: Failed to create videosrc bin
    1: Failed to find element factory with name 'videoflip' for creating element

Install gst-plugins-good and check if videoflip is installed with

gst-inspect-1.0 videoflip