Had the same problem and solve it the easiest way… try that: duplicate your footage and put a layer one on top of the other but slightly off time for a couple of frames (make the upper start begin 2 frames later than it’s duplicated).
Lower the upper clip oppacity to 50% and add some motion blur effect at you personal taste. There’s a motion blur option you can use aswell.
You can repite this operation as many times as you want to achieve the effect you desire…