Update kimera_vio_install.md: modify opencv cmake command #237
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Modify cmake command to fix opencv2/viz.hpp header missing error.
Run cmake -DWITH_VTK=On without including opencv_contrib modules folder will produce no error. However, the viz folder and related header will be missing from opencv2 library folder. That leads to Kimera-VIO build error (viz header missing).
To fix that, we have to pull opencv_contrib repository and include it to cmake command.