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Obtain updated track velocities and velocity covariance matrix

`velocity = getTrackVelocities(tracks,velocitySelector)`

```
[velocity,velocityCovariances]
= getTrackVelocities(tracks,velocitySelector)
```

returns velocities of tracked objects.`velocity`

= getTrackVelocities(`tracks`

,`velocitySelector`

)

`[`

also returns the track velocity covariance matrices.`velocity`

,`velocityCovariances`

]
= getTrackVelocities(`tracks`

,`velocitySelector`

)