how to find nose in face image captured from webcam

Hi, i want to find nose in face image captured from webcam. Here, i use external webcam, logitech C170. Can somebody tell me how to start it ? or maybe algorithm to process that image. thank you so much

[Javier]

you can modified this program =)

http://www.mathworks.com/matlabcentral/fileexchange/25056-fast-eyetracking/content/eyetracking.m % Purpose : Find distinct points of the Pupils, Nostrils and Mouth in % images taken from a video stream to get the Pupils' position in relation % to the fixed position of Mouth and Nose

[Lidank Abiel]

which one program i must start first Claudio ?, what step ?, i'm confused