until now there is no ARLib available in B4a which realy works. One reason is, that "AR" is a very widespread thing, starting from puting something into the camaraview and move it while moving the device (using the sensors) up to pattern recognition. Starting with the easy one (camera and sensors) you can do a lot with b4a without any AR-Lib. See the 2 examples attached, which are only using cameraex class, orientation sensors and images.
The first puts an image onto the camaraex panel when moving in the right direction with the camera. the second takes points of black forest mountains and showing a symbol in the camera.
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