No. You can’t.
Please consult the guy who provide the model to you for the details for the output tensor data content and format.
Please refer to NVIDIA DeepStream SDK API Reference: NvBufSurface Struct Reference | NVIDIA Docs for the NvBufSurface. There is also sample for how to get the raw data inside NvBufSurface. DeepStream SDK FAQ - Intelligent Video Analytics / DeepStream SDK - NVIDIA Developer Forums