Add check_camera_blur example action

[YvesSchoenberg]

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[YvesSchoenberg]

@GabeMedrash, @BBarash, what would you think if we add better SDK support for images? For example:

img = msg.get_img(fmt="cv2", colorspace="BGR")

so users don't need to do any of this:

def convert_image_msg_to_cv2(msg):
    return cv2.imdecode(np.frombuffer(msg["data"], np.uint8), cv2.IMREAD_COLOR)

Questions:
1.) Would this bloat up our SDK because we need to add opencv etc dependencies? Could we put it into the analytics package?
2.) What happens if someone calls msg.get_img() on a message that's not an image - is it acceptable to just throw an error?