Kooha seems to need `gst-plugins-good`

Description:

Without gst-plugins-good I get this error

Failed to find element factory with name 'videoflip' for creating element

Additional info:

• package version(s): 2.3.0-5
• config and/or log files:
• link to upstream bug report, if any:

Steps to reproduce:

1. install kooha without gst-plugins-good installed
2. start kooha
3. press Record