OK, so I just tried this and found that jetcam was getting installed to /usr/lib/python3.8/site-packages/ (which wasn’t in the PYTHONPATH)
Instead, I built/installed the jetcam wheel and was able to import it then. These are the steps I ran in container:
cd /opt
git clone https://github.com/NVIDIA-AI-IOT/jetcam
cd jetcam
python3 setup.py bdist_wheel
pip3 install dist/jetcam*.whl
cd /
pip3 show jetcam
python3 -m 'import jetcam'
That said, it not being updated in 4+ years I don’t know if the camera acquisition in it still works or not (although the nvarguscamerasrc GStreamer element that it uses, is still providing in JetPack) That DLI tutorial is supported on the original Nano and JetPack 4.