Get NvMOTFrame

How to access into NvMOTFrame from plugin? I saw it from nvdstracker.h but i dont know how to modify it from gst-dsexample

**• Hardware Platform (Jetson / GPU)**JetsonNano
• DeepStream Version5.0
**• JetPack Version (valid for Jetson only)**4.4
• TensorRT Version7.1
**• NVIDIA GPU Driver Version (valid for GPU only)**460
• 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)

These structure are used to customize low level tracker lib, you cannot access it from gst-dsexample