We have developed a markerless tracking system enabling to estimate head pose through limited apertures of a head coil. The system, composed of a mirror and four MR compatible cameras, tracks the patient's facial features. The patient’s face image through the head coil’s apertures is monitored during scanning. To demonstrate its feasibility for tracking, a volunteer was moving his head arbitrarily inside a scanner. Despite the limited apertures of the head coil, the facial features were successfully tracked.