An insightful video OpenCV Tutorial by Kyle Hounslow written in C++ (MS Visual Studio):

Some key concepts to take away:

• handy to have a debugMode for ease of investigations.
• convert color video into grayscale. Find the moving object defined by “changed pixels”.
• use “blurring” to make the fast moving object easier to visualize.
• make use of the keyboard for greater controls. e.g. p for pause/un-pause, t for track/un-track, etc.

All credits go to Kyle Hounslow.