As you can see, the algorithm has essentially found Cloe's face, so it's this white bounding box, and it's tracking the main feature points on her face, so her eyebrows, her eyes, her mouth and her nose.
Como pueden ver, el algoritmo detectó el rostro de Chloe, es este cuadro delimitador blanco, que detecta los contornos principales de sus rasgos faciales, sus cejas, sus ojos, su boca y nariz.