You should run dumpbin on the pyd generated by get_python_api, its path is given at the end of the install with get_python_api
It gives the path to the conda env folder, so it doesn’t matter if you run it from conda or not, just run it on the correct pyd. It should look like C:\Users\user\.conda\envs\py38\Lib\site-packages\pyzed\sl.cp38-win_amd64.pyd.
It seems that usually, referencing this post,
the missing dll often is
NvEncoreApi.dll