You can find hundreds of designs from Thingiverse and Printables to print as your mount for your GoPro, but I need is a simple mount that doesn't move, so it wouldn't affect the performance of the 3D printer. Adding weight to any of the stepper motors can negatively impact the performance and the quality of the print. Most camera adapters are mostly designed for the side or the bed of 3D printers which doesn't provide a center point of view.

The only other location to attach an adapter that does not affect the print quality and center alignment is the Y-Axis v-slot aluminum extrusion.

You will still need extension arms to prevent hitting your 3D Printer bed.  You'll need  [2 pieces] M4 T-Slot Nuts (or similar) and [2 pieces] M4 x 8mm Machine Screws to attach the adapter.

Youtube Video:
https://www.youtube.com/watch?v=B08B0npyY44