def check_for_float(input1, exit = True): Checks if the type of "input1" is a float and returns the value if so. total = 0.0 average = 0.0 ...

SOLUTION : MAY BE YOU INSTALL OPENCV BUT OPENCV NOT CONTAIN VIDEO MODULE SO INSTALL GITHUB FILE OF OPENCV AND RUN THIS FILE (opt_flow )IN OPENCV/PYTHON/SAMPLE/OPT ...