Apparent velocity on 3D comp

Hi!

I have a comp with several footages and I'm using a masked adjustment layer with the Turbulent Displace effect to simulate heat waves. The problem is that the comp contains a camera movement that acts as a displacement of the distortion of Turbulent Displace. When the camera stops Turbulent Displace happens to be animated only by the property "Evolution" and this difference that I would like to eliminate.

I thought that I could access the speed of the moving layers via expression to compensate by doing the opposite movement at the "offset" parameter on the Turbulent Displace, but being a 3D composition the only animated parameter is the camera position. There is a way to calculate the apparent motion speed from layers based on the 3D camera of a comp?

Thanks!

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Gabriel Camelo