Based on Face recognition with OpenCV, Python, and deep learning Pyimagesearch's tutorial is built this face recognition counter.
This facial recognition system detects the faces of Brad Pitt and Edward Norton, main characters on Fight Club movie.
In each frame are detected the faces and is shown a real time bar plot. This was ran on a clip of the movie and the output is here.
I ran this project on Google Colab with GPU. The video last 2:13 [m] and it took 3:41 [m] to get the output video.