This paper presents a camera-based physical movement assessment that is the key part of a patient ambulation monitoring system, with the goal of assessing the feasibility of the system and addressing its main parameters and limitations related to encouraging early and progressive ambulation. This system uses regular, off the shelf webcams in combination with fiducial markers and computer vision to accurately quantify the movement of a human subject. We have achieved less than 10% error in measuring the distance traveled by a subject when moving in the field-of-view of a single camera and an average error reduction of 5% with the addition of a second camera.