On the PC I think the easiest way is to use something like this:
https://www.bhphotovideo.com/c/produ...to.html?sts=pi
Drivers can be a pain to get it to work though.
On the Mac I used to use a DV converter box like this:
https://www.amazon.com/Datavideo-DAC.../dp/B00009XV2L
And imovie or Quicktime Pro to capture.