Re: replacing flock of birds with something else?

Similar to Dave's suggestion, I would start by creating a clean plate, but instead of tracking each bird, I would use a 3d tracker like Camera Tracker from the Foundry to track the footage, then, instead of creating a camera solve, I would create a Null from each of the track points that track the birds and parent a layer with the letter B to it.

Tudor "Ted" Jelescu
Senior VFX Artist