If you want to skip to the FBX export, it is at around18:35 min into the video
In this video demonstration which I created specifically for my Visual Effects Class in school, I show how I track an image sequence and export the tracked camera data into an FBX file which in turn is imported into Maya 2018. In Maya 2018 the 3D element is rendered with the tracked camera and brought back into Fusion for compositing.