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with opencv3, you will have to get a BackgroundSubtractorKNN or BackgroundSubtractorMOG2 like this:
cv2.createBackgroundSubtractorKNN([, history[, dist2Threshold[, detectShadows]]])
cv2.createBackgroundSubtractorMOG2([, history[, varThreshold[, detectShadows]]])
createBackgroundSubtractorGMG and createBackgroundSubtractorMOG were moved to the bgsegm module in opencv_contrib repo:
cv2.bgsegm.createBackgroundSubtractorGMG([, initializationFrames[, decisionThreshold]])
cv2.bgsegm.createBackgroundSubtractorMOG([, history[, nmixtures[, backgroundRatio[,noiseSigma]]]])