Do OpenCV have flag that control zoom-in/out function of camera device?

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Hi everyone,

I want to control zoom-in/out function of a camera - such as Logitech 930. But i don't want to use resize function in OpenCV. Same as when you want to turn off focus of camera, you may be use the following flag:

camera.set(cv2.CAP_PROP_AUTOFOCUS,0)
camera.set(cv2.CAP_PROP_FOCUS,focus_value)

I want to follow this to control zoom-in/out before reading image from camera.

Update 1:

I find out this flag: cv2.CV_CAP_PROP_ZOOM. But i don't know how it works.

Please, show me the way to do it.

thank all!