Represents the reason tracking was lost.
public enum NotTrackingReason
The camera is in use by another application. Tracking may resume once the app regains access to the camera.
Tracking is lost due to excessive motion.
Tracking is being initialized.
Tracking is lost due to insufficient visual features.
Tracking is lost due to poor lighting conditions.
Tracking is working normally.
Tracking is resuming after an interruption.
Tracking lost reason is not supported.