How to scale CamTrackAR in Unreal Engine

When I bring in the CamTrackAR data to Unreal Engine, it is not always at the right scale (the model is way too big for the video - when I composite them, I look like a mini-figure in the world :-). How can I match the world scale to the camera data? Is there an easy way to match it, rather than having to rescale the entire world? Thanks!

App is awesome by the way 😎