If I've got your right, I've seen what you describe by doing a 'Dronie' i.e. zooming up and away from you, but then reversing the filming in post-production - so it appears like it's starting a long way away and flying toward you. The other thing you might want to try is the 'Active Track' mode called 'Spotlight'. Spotlight allows you to highlight and target an object that the Mavic will keep in the camera-centre, no matter where the object moves to. I know that you can set up Spotlight from a stationery hovering drone, but I've not seen any vid's that confirm or deny that you can Fly the drone around while it's in that mode. In other words, see if 'Spotlight' will work in reverse (moving drone / stationery target). Let me know what you find ...