Opencv网络摄像头摄像头检查一段时间后的变量状态

I writing a code to detect human fist inside a box from the webcam. What i want is after checking there is a fist inside, the program will wait for 2 seconds. After 2 seconds, if there is still a fist inside, then it will put a text "FIST" Here is my code :I writing a code to detect human fist inside a