<p>There are multiple places from which I suggest you try to learn:</p>

<p>1) The CNN course from coursera <a href="https://www.coursera.org/learn/convolutional-neural-networks" rel="nofollow noreferrer">https://www.coursera.org/learn/convolutional-neural-networks</a>
This course has a good explanation on yolo(There assignment is on car detection as well which can easily be extended to car counting) and the rest of the course is quite nice as well</p>

<p>2)<a href="https://towardsdatascience.com/yolo-you-only-look-once-real-time-object-detection-explained-492dc9230006" rel="nofollow noreferrer">https://towardsdatascience.com/yolo-you-only-look-once-real-time-object-detection-explained-492dc9230006</a></p>

<p>The article focus on a few implementation details and talks about the papers yolo and yolov2 , and helped me clear a out a few issues i had when i was trying to implement yolo </p>

<p>3)The original paper (although this may be too advanced ): <a href="https://arxiv.org/pdf/1506.02640v5.pdf" rel="nofollow noreferrer">https://arxiv.org/pdf/1506.02640v5.pdf</a></p>

<p>4)A keras implmentation : <a href="https://github.com/experiencor/keras-yolo2" rel="nofollow noreferrer">https://github.com/experiencor/keras-yolo2</a></p>

<p>A simple git clone if you wish to simply have the code , although i do not recommend this as it has very little actual learning and is simply a download and use option </p>
Making an Application Using YOLO
<p>I'm new to YOLO and trying to make car counting application using YOLO. The cars is from video file. Is there any reference? Thank you</p>