How to extract detected objects' images

hi,i want to add some image informations into NvDsObjectMeta.So i need to extract detected objects’ images and then send images into my opencv codes.
but i dont konw how to get detected objects’ images when the pipeline is running.

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU)
• DeepStream Version
• JetPack Version (valid for Jetson only)
• TensorRT Version
• NVIDIA GPU Driver Version (valid for GPU only)
• Issue Type( questions, new requirements, bugs)
• How to reproduce the issue ? (This is for bugs. Including which sample app is using, the configuration files content, the command line used and other details for reproducing)
• Requirement details( This is for new requirement. Including the module name-for which plugin or for which sample application, the function description)

please refer Deepstream sample code snippet - #3 by bcao

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