高速跟踪: 当检测精度较高，视频帧率较高时，跟踪问题就会变得很简单，主要是多阈值目标检测和 判断前后帧的重合率
High-Speed Tracking-by-Detection Without Using Image Information
Advanced Video and Signal Based Surveillance (AVSS), 2017 14th IEEE International Conference on
Assessing Post-Detection Filters for a Generic Pedestrian Detector in a Tracking-By-Detection Scheme
https://github.com/bochinski/iou-tracker/
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