I don't think this is possible, this plugin is a wrapper around this https://github.com/kylemcdonald/FaceTracker, which track faces, and inside a recognized face it can detects the single parts. I don't think you can get the parts before having a full detected face, but I'm not sure.
Maybe @kylemcdonald can answer your question in a more detailed way.
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Mouth tracking with ofxFaceTracker
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