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You are already using namespace cv, so you don't have to write cv:: infront of your methods. That won't cause an error, but just nice to know.

The KalmanFilter is in the #include "tracking.hpp", and i can't see that you have included that, so try to do that and see if it still gives an error.

You are already using namespace cv, so you don't have to write cv:: infront of your methods. That won't cause an error, but just nice to know.

The KalmanFilter is in the #include "tracking.hpp", and i can't see that you have included that, so try to do that and see if it still gives an error.

Here is a sample code of how to use it:

https://github.com/Itseez/opencv/blob/master/samples/cpp/kalman.cpp