These are mostly notes to self. I assumed this process would be easy but there were some pitfalls and hiccups I'm documenting here. Huge thanks to the open source developers behind https://github.com/time4tea/gopro-dashboard-overlay and https://kdenlive.org/ without which this couldn't be possible.
- Pull the video off the GoPro (this needs to be done via the microsd card directly for "reasons").
- Download the .fit file from Garmin Connect (GPX file won't have power data)
- Run the https://github.com/time4tea/gopro-dashboard-overlay tool to generate a video of the data with a transparent background
(assuming you have a python environment with the above tool installed)
$ cd code/gopro_edit_gpx