The easiest option would probably be to use a camera adapter to hold the Go-Pro up to the eyepiece - something like this:
http://www.bintel.com.au/Astrophotog...oductview.aspx
I don't know how much control over exposure etc you get on a Go-Pro - it might be easier to use a smartphone or a basic digital camera - if only to minimise the issues of vignetting that you will get with a very wide-angle lens on the Go-Pro.