通过修改metadata来修改一个图像中的label信息，进行扩充；obj_label: 一个数组，用于存储描述被检测对象类别的字符串

A.我们想要将这个标签进行扩充，

例如让他显示距离信息，让他显示坐标信息等等，要怎么扩充呢

B.官方给的这个metadata的解释

1, what is the meaning of the attribute misc_obj_info, and can the user see it in the output of the detection video?
please refer to the code comment, it is not used to display, NvDsObjectMeta’s NvOSD_RectParams, NvOSD_TextParams are used to display.
/** Holds add