When canvas size is increased Face tracking stops

Hi,
If I use the provided samples then it works fine and tracks the face but if I increase the canvas size face tracking stops. Reason to increase canvas size is because the default size it too small for Mobile devices.

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-Thanks

Reproduce the issue with the provided samples, first using the 320×240 canvas and then a larger canvas suitable for mobile devices. Trace how the canvas dimensions are used by face tracking and identify why tracking stops; done means face tracking continues to work after the canvas is enlarged.

Written by the indexing model from the issue text.