Hi recently i started writing an app, wchich was supposed to detect faces on image from webcam. Everything worked except: the app hasn't been detecting faces. I was looking for errors, but in the meanwhile I decided to run app from opencv java examples: http://docs.opencv.org/doc/tutorials/introduction/desktop_java/java_dev_intro.html but it doesn't detect faces! Doesn't even display any errors, just writing the input picture as output one. What am I doing wrong? Everything compiles without errors, also I haven't changed any line of code.