What is the best way to migrate from 6.1 to 6.3 Deepstream ? Also Is there any way I can see the compression of each plugin files and code?

There is no update from you for a period, assuming this is not an issue anymore. Hence we are closing this topic. If need further support, please open a new one. Thanks

The release note may help you https://docs.nvidia.com/metropolis/deepstream/DeepStream_6.3_Release_Notes.pdf

The historical documents are also useful. DeepStream SDK FAQ - Intelligent Video Analytics / DeepStream SDK - NVIDIA Developer Forums

The best way is to use the configuration files in /opt/nvidia/deepstream/deepstream/samples/configs/deepstream-app/