You can add more than one face tracker to a Spark AR Studio project, to create an effect that can be used by more than one person.
The first face tracker you add will track the first face that appears in the scene.
You'll need to assign a face to every other face tracker you add. To do this:
Each time you add a face tracker, an additional Face will be added to the Tracked face dropdown list.
Assign each new face tracker to a different Face.
Adding more face trackers will have an impact on performance, so it's good idea test your effect as you build it using the Spark AR Player app.