simple vector question

I have a complex class that I am storing in a vector. I seem to have a
memory leak and I think it's because I don't really know how to use
vectors properly. Not only that but my code is overly complex.

/***************************************************/
class BmTrack {
public:

    BmTrack();
    BmTrack(BmDetection* detection, double deltaT, double sigma1, double
sigma2, int* track_total);

    ~BmTrack();

private:
    int track_num; //track number
    int track_class; //track classification
    int track_class2;
    CvKalman* kf; //kalman filter structure
    std::vector<double> x; //track locations for each frame
    std::vector<double> y;
    double v; //average track velocity
    double v2;
    int lane_num; //lane number
    int track_life; //count down to removal of track
    CvMat* W; //class membership
    CvMat* logW; //log for probabililty

    CvMat* Meas; //measurement history

    int flag_image; //tells if track image saved
    IplImage* image; //image of object
    CvRect bb; //bounding box

};

/***************************************************/
/*Tracks*/
typedef std::vector<BmTrack*> BmTrack_vector;

class BmTracks {

public:
    BmTracks();
    BmTracks(BmDetections* detections, double deltaT, double sigma1,
double sigma2, int* track_total);

    ~BmTracks();

private:
    BmTrack_vector tracks;

    CvMat* Sigma_meas; //inverse S for var of measurements

    int T_frames; //number of frames to track before taking snapshot

};

/***************************************************/

I create create the tracks object by a loop

for (int i=0; i<num_Tracks; i+=1) {
     tracks.push_back(new BmTrack(d,deltaT,sigma1,sigma2,track_total));
}

The size of the vector is constantly changing by removing elements from
within the vector. The way I'm dong it looks something like this.

BmTrack* t;
for(i=num_tracks-1; i>=0; i-=1) {
    if(dead_track[i]) {
        t = tracks.at(i);
        delete t;
        tracks.erase(tracks.begin()+i);
    }
}

Am I doing something wrong here. I don't have a copy or assignment
method defined for BmTrack. And is it a bad idea to create the
BmTrack* t variable outside of my loop? Thanks for any help.
Brendan

      [ See http://www.gotw.ca/resources/clcm.htm for info about ]
      [ comp.lang.c++.moderated. First time posters: Do this! ]