Camera Tracking - Nuke 101: Professional Compositing and Visual Effects - page 419

The camera in the shot is a free camera, so you'll leave the setting as is. It's not
always apparent whether the camera was free—in fact, the best way to know is
by being on set and writing it down. However, in this case it is apparent the cam-
era is moving as there is parallax in the shot. These controls are good enough for
this shot. It is good practice to try tracking using the default values; if that's not
enough, start over with different values, depending on the shot.
2. Switch back to the CameraTracker tab ( FIGURE 10.5 ).
Figure 10.5. The CameraTracker tab.
The CameraTracker tab provides some properties to help out the tracker as well.
The first one is called Mask. It controls Camera Tracker'ssecond input, the Mask
input ( FIGURE 10.6 ).
Figure 10.6. CameraTracker's Mask input is the little arrow on the left of
the node.