ROpenCVLite is a utility package that installs OpenCV within R for use by other packages. This package is not a wrapper around OpenCV (it does not provide access to OpenCV functions in R), not is it a computer vision package for R. All it does is compiling and installing OpenCV within your R installation so that other packages can easily find it and compile against it.
All information about the functioning of this package can be found on its website at: https://swarm-lab.github.io/ROpenCVLite/