Jorrit Schulte shows that you can create a clean plate and remove an object by using Photoshop to create a clean plate and MochaAE to track in the modified image in After Effects.
Have an object in your scene that you don’t want there, and don’t have the opportunity to reshoot? In this tutorial you will learn a basic technique to remove those objects
I know that I probably say this every time there is a tutorial on removals, but Mocha Pro automates the process so effectively, and save so much time, that it would be a shame not to share that information at any chance. Here, Jorrit shows a manual method for creating easy removals in After Effects using Mocha AE for tracking. Check out the tutorial for Creating a Simple Clean Plate Removal in After Effects here.