Final answer:
Markerless motion capture is the best option for tracking kinematics in stroke patients during at-home rehabilitation.
Step-by-step explanation:
The best option for tracking kinematics in stroke patients while they are performing an at-home rehabilitation program would be markerless motion capture. This method uses computer vision algorithms to track the movement of the patient without the need for markers or sensors. It is non-invasive and allows for more natural movement during the rehabilitation process.