If you are planning to use VideoCapture class, first you should make sure opencv can recognize your camera. It is best to start with Open CV for python on raspberry pi, try to create a VideoCapture object and see if it can grab frames from your camera. If it can, then you should be able to use Emgu CV's VideoCapture class to grab frames from camera too. If not, you should find a camera that works with Open CV's VideoCapture class in python on raspberry pi.
Enable opencv_freetype for Android.
Prefer the NDK from Visual Studio over other custom installation.
Fix for the windows build.
Fix VTK for ubuntu 18.04
Fix ffmpeg deployment.
Fix Windows build.
Enable freetype for OSX build