Now that you know how to track different things using the framework, you can try tracking your nose, mouth, and ears too. Let's use a nose detector to overlay a funny nose:
You can refer to the code files for a full implementation of this detector. The haarcascade_mcs_nose.xml, haarcascade_mcs_mouth.xml, haarcascade_mcs_leftear.xml, and haarcascade_mcs_rightear.xml cascade files can be used to track the different face parts. Play around with them and try to overlay a mustache or Dracula ears on yourself.