Yes. PGIE detect objects and generate object meta with bbox information.SGIE get the object meta and crop the object images from video and do the inference.
There is sample plugin gst-dsexample source code in /opt/nvidia/deepstream/deepstream/sources/gst-pluins/gst-dsexample. The code of generating object meta is in attach_metadata_full_frame() function.
Please read the document and source code carefully and make sure you are already familiar with gstreamer.
https://docs.nvidia.com/metropolis/deepstream/dev-guide/text/DS_plugin_metadata.html
https://docs.nvidia.com/metropolis/deepstream/dev-guide/text/DS_plugin_gst-nvinfer.html