Where is the aruco module?

At this documentation link it says:

A full working example is included in the calibrate_camera_charuco.cpp inside the modules/aruco/samples/.

But there is no “aruco” folder inside modules. The only files that contains “aruco” are two images in:

There is no sample, no include, so I can’t use aruco.

Where is it?

it’s here in opencv_contrib

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