Planar track is a technique similar to the 2D tracking that we learn before, this one instead of selecting an image point to create a track, you create an alpha mask that tracks the shape of it. After this with a cornerpin we can stick it to the corners of the shape and merge it over to the original plate.
This is the original plate, where I’m going to swap some posters for others.
Here you can see the end result:
This is the node editor, we can see the structure where we create a mask and then generate cornerpins for each of them.
