OpenCV Webcam Exercise

[DarioHett]

For whoever wants to try the OpenCV Webcam exercise, I ran in minor issues. So I'll leave my learnings here for future reference.

Install OpenCV using their install guide.

Remark:
Clone their 3.4 repository, "OpenCV 4.x+ requires enabled C++11 support" and would require other workarounds. Using git clone -b 3.4 https://github.com/opencv/opencv.git fixed it right away.

Also set the "-DOPENCV_GENERATE_PKGCONFIG=ON" when executing make:
cmake -DCMAKE_BUILD_TYPE=Release -DOPENCV_GENERATE_PKGCONFIG=ON -DCMAKE_INSTALL_PREFIX=/usr/local .. such that your Makefile for the homework can set the required flags through pkg-config.