I have a DJI F550 with a mounted GoPro Hero3. Can I process images using this set up?
Yes you can! Use the GoPro in auto-shutter mode i.e. 1 img/sec (https://support.pix4d.com/hc/en-us/articles/202560399-How-to-use-the-GoPro-cameras-with-Pix4Dmapper)
Since your autopilot is the NAZA you can follow the instructions here: https://support.pix4d.com/hc/en-us/articles/202560819-How-to-Process-images-acquired-with-different-models-of-DJI