New to my camera and just watching your tutorials. the one on Video settings shows Distortion Correction as the last item on the short cut menu (before going back to Resolution). It is missing on mine – I found it in the full set up menu. You need to put it back as a short cut or change the video. (and before you ask I have what I think is the latest firmware 2.7 from April 2018).
Thanks for the great tutorials