Per the Manual:
" Using a wall charger other than a GoPro charging
device can damage the GoPro camera battery and could
result in fire or leakage. With the exception of the GoPro
Supercharger (sold separately), only use chargers marked:
Output 5V 1-3A. If you do not know the voltage and current
of your charger, use the included USB cable to charge the
camera from your computer. "
You probably can use the MacBook Pro Power Adapter; however, if you have any issues it will not be covered.
Per the Warranty:
"For safety purposes, use only genuine GoPro
supplied or purchased parts with your Fusion. The use of any other component, accessory,
or charger that is not recommended by GoPro may cause fire, electric shock, or injury. Your
warranty does not cover damage caused by use of unauthorized attachments. For approved
accessories, visit gopro.com. "
