custom bounding box parsing function need more feilds

[dongfangduoshou123]

like the yolov4's detection custom parse function implemented in this repo, its output is not identity to the tao output. I know it is because the yolov4 parse need a ratio param, which is computed from frame_original_h, frame_original_w, network_input_w and network_input_w, but in current detection parse function interface, the frame_orignal_h and orignal_w can not be obtained yet.

So, I think the current detection parse function interface should fix this bug like to add feild like frame_orignal_h and frame_orignal_w in the NvDsInferNetworkInfo struct.
current:
typedef struct
{
/** Holds the input width for the model. /
unsigned int width;
/* Holds the input height for the model. /
unsigned int height;
/* Holds the number of input channels for the model. /
unsigned int channels;
} NvDsInferNetworkInfo;
after added:
typedef struct
{
/* Holds the input width for the model. /
unsigned int width;
/* Holds the input height for the model. /
unsigned int height;
/* Holds the number of input channels for the model. */
unsigned int channels;

     unsigned int frame_orignal_h;
      unsigned int frame_orignal_w;
    } NvDsInferNetworkInfo;