To lust have a sneek preview an online viwer can be used:
First download exiftoll's gpx print format file. This needs to be done only once:
wget https://raw.githubusercontent.com/exiftool/exiftool/master/fmt_files/gpx.fmt
Than you can extract the gpx infos from a GoPro video:
exiftool -p ./gpx.fmt -ee ./GH012345.MP4 > ./GH012345.gpx
Software to show the extracted GPS-Track: