VideoCapure: uncompressed 16 bit video stream (Y16)

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Setup:

• Ubuntu 16.04 LTS
• OpenCV-python version 3.4.1

• $v4l2-ctl -d /dev/video3 --list-formats
      ioctl: VIDIOC_ENUM_FMT
      Index       : 0
      Type        : Video Capture
      Pixel Format: 'Y16 '
      Name        : 16-bit Greyscale
  

Using VideoCapture I get 3 channels array of uint8 instead of single channel uint16. I can't set the proper CAP_PROP_FORMAT. Thus, the read method returns also array of uint8. How to capture 16 bit video with OpenCV-python?

 >>> cam = cv2.VideoCapture("/dev/video3")
 >>> cam.get(cv2.CAP_PROP_FORMAT)
16.0 (cv2.CV_8UC3)
>>> cam.set(cv2.CAP_PROP_FORMAT,cv2.CV_16U)
VIDEOIO ERROR: V4L2: setting property #8 is not supported
True
>>> _, frame = cam.read()
>>> frame
array([[[0, 0, 0],
        [0, 0, 0],
        [0, 0, 0],
        ...,
        [0, 0, 0],
        [0, 0, 0],
        [0, 0, 0]],

       [[0, 0, 0],
        [0, 0, 0],
        [0, 0, 0],
        ...,
        [0, 0, 0],
        [0, 0, 0],
        [0, 0, 0]],

       [[0, 0, 0],
        [0, 0, 0],
        [0, 0, 0],
        ...,
        [0, 0, 0],
        [0, 0, 0],
        [0, 0, 0]],

       ...,

       [[0, 0, 0],
        [0, 0, 0],
        [0, 0, 0],
        ...,
        [0, 0, 0],
        [0, 0, 0],
        [0, 0, 0]],

       [[0, 0, 0],
        [0, 0, 0],
        [0, 0, 0],
        ...,
        [0, 0, 0],
        [0, 0, 0],
        [0, 0, 0]],

       [[0, 0, 0],
        [0, 0, 0],
        [0, 0, 0],
        ...,
        [0, 0, 0],
        [0, 0, 0],
        [0, 0, 0]]], dtype=uint8)