菜鸟初学者，第一次编写基于OpenCV的摄像头开启程序。是基于控制台形式的。读取级联检测器文件进行识别。简单易扩展。(Rookie beginner, for the first time, wrote the camera opening program based on OpenCV. It is based on the console form. Read the cascade detector file for recognition. Simple and easy to expa