Tracking with opencv. Errors with threads and VideoCapture

Thanks a lot for answer!

  1. I mean that I try to use my local machine and server. From server and local I 've different results (bc yolo detect with different velocity.
  2. Understood!
  3. Understood!
  4. I need turn on a lot of cameras for my system (through server). I thought that I can do it with threads. I need to connect camera with yolo (pretrained with my custom dataset) and turn on parallely 100 cams.
    How can I do it?