code: func (d Device) DecoderUtilization() (uint, uint, error) {
  	if C.nvmlHandle == nil {
  		return 0, 0, errLibraryNotLoaded
  	}
  	var n C.uint
  	var sp C.uint
  	r := C.nvmlDeviceGetDecoderUtilization(d.dev, &n, &sp)
  	return uint(n), uint(sp), errorString(r)
  }
docs: // DecoderUtilization returns the percent of time over the last sample period during which the GPU video decoder was being used.
  // The sampling period is variable and is returned in the second return argument in microseconds.