Add humanFilter and camera files to the Makefile.

The humanFilter and camera files are currently compile-able through the command line and will run when paired with AITest2.cpp:

#include "/camera.hpp"
int main(int argc, char** argv)
{
Camera cam(0);
cam.record();
return 0;
}

g++ -std=c++11 -ggdb `pkg-config --cflags --libs opencv` -static-libstdc++ AITest2.cpp camera.cpp humanFilter.cpp -o AITest2

However, they will not currently compile alongside the project using make. The Makefile needs to be updated.

Open the Makefile and compare its current source list with the files named in the issue: camera.cpp and humanFilter.cpp. Run the existing make workflow, then confirm the project builds with both files included alongside the current OpenCV configuration.

Written by the indexing model from the issue text.