Migration from TRT5 to TRT7

Description

Lack of understanding how to migrate SSD code written for TensorRT5 to the latest TensorRT7.

A clear and concise description of the bug or issue.
While migrating from TensorRT5 to TensorRT7 I stumbled into a lack of understanding how to correctly use the new V2 plugin system on c++. For example, calls like createSSDDetectionOutputPlugin or createSSDAnchorGeneratorPlugin are now deprecated. Is there an example how to use use SSD on TensorRT7?

Environment

Ngc tensorflow 20.8 docker container

TensorRT Version: 7
GPU Type: Titan V
Nvidia Driver Version: 450.66
CUDA Version: 11
CUDNN Version: 8
Operating System + Version: Ubuntu 18.04.4 LTS
Python Version (if applicable): 3.6.9
TensorFlow Version (if applicable): 20.8
PyTorch Version (if applicable):
Baremetal or Container (if container which image + tag): Ngc tensorflow 20.8 docke

Hi @bnascimento,
We highly encourage you to move to IPluginV2IOExt or IPluginV2DynamicExt to be able to use all the new plugin functionalities.
Please refer to below sample for your reference: