One-half second exposure should work for a subject with a brisk walking pace. Time the shutter opening with the planting of the foot on the ground. Dark clothing and a light background will complete the effect.
Would you like to do this and post your result, as I don't think it would work.
“The contemplation of things as they are, without error or confusion, without substitution or imposture, is in itself a nobler thing than a whole harvest of invention”