To be clear. It is not a viewer. It "just" extracts the gps information (in gpx format).
I normally usr mpv to view dashcam video, but mplayer and vlc and more also work.
The gps information is normally displayed in the video.mov2gps just allows the underlying data to be extracted for use with other programs. In my case maily for josm and mapping for Openstreetmap.
mpv is extremely impressive and is very powerful and flexible, but there is a learning curve.
But perhaps your dashcam doesn't include the gps info in the video images and you are seeking a player
that decodes the gps data stream and uses it to overlay or embed in the video images? Sounds computationally expensive.