This is just a sample code and a script from darknet https://github.com/pjreddie/darknet
I am using chestnut-detection.py with chestnut-picker repo to send detection data for further used.
Both human-detection.py and chectnut-detection.py are doing the same thing for detecting stuff, showing the video (local or stream) and stream the detection information out for other usage.
human-detection has three cameras supporting, webcam, Intel Realsense D435 and GoPro. For GoPro camera please check on this repo https://github.com/rasheeddo/testGoPro .