Make change between different intrinsic calibration without losing trackpoints
It seems to be possible to switch between different intrinsic calibrations, by revert the calibration and then applying the new one.
```python
map1, map2 = cv.initUndistortRectifyMap(
camera, distortion, np.eye(3), camera_wrong,
frame.shape[:-1][::-1], cv.CV_16SC2
)
x = map1[int(point.y)][int(point.x)]
```
issue