title: How can I create a simple blur effect on a faceMesh in Spark AR Studio?
body: <p>I want to create a very simple AR effect that simply blurs the user's face (I'm using a faceTracker with a faceMesh that has a material blurMat applied)
  but I don't really know what to do now.
  I am quite fit at javascript but I never did any image manipulation.</p>