Bug fix in camera.py

[Manusha17]

@Tianxiaomo @KelvinCPChiu @wenh06 can anyone please check and accept this commit.

[C-popKingJames]

yes, i also find this problem,your fix is bigger than help me a lot. if I not fixed ,i will meet this problem

Traceback (most recent call last):
File "E:/DeepLearning/pytorch-YOLOv4-master/camera.py", line 69, in
orig_im = plot_boxes_cv2(frame, boxes, class_names=class_names)
File "E:\DeepLearning\pytorch-YOLOv4-master\tool\utils.py", line 116, in plot_boxes_cv2
x1 = int(box[0] * width)
TypeError: int() argument must be a string, a bytes-like object or a number, not 'list'