You can use the video of someone's face when they're using the effect as a texture in your scene, by extracting the face tracker texture.
You can then apply the texture to a material and object - for example, to create a face swap effect.
You'll see a texture called faceTracker0 in the Assets panel:
The texture can be applied to any material channel. It's a good idea to use a flat material. Or, drag it into the Patch Editor to combine with other visual shader patches.
If you select the texture in the Assets panel, you'll be able to see and edit its properties in the Inspector.
There are 2 options to choose from here.
Use this option to create a 3D representation of the user's face. You'd generally use this mode when applying the texture to a face mesh, for example in a face swap effect.
2D Bounding box
This mode will create a flat cutout of the face. You could use this mode to create 2D animations featuring the user's face.
Enable Opening and Alignment
If the texture is applied to a face mesh, check the boxes next to Eyes and Mouth. This will make sure the texture aligns properly with the face mesh.
Start by adding the face trackers:
Then, edit the second face tracker so that it responds to the second face to appear in the scene:
Next, create the face mesh, textures and materials:
The face mesh will have hard edges. To blend these with the face, use the face mesh mask included in the face reference assets.