Description:
Currently, when trying to import opencv bindings into python, there is a complaint that hdf5 is not installed and cv2 won't import. As can be seen below, opencv has hdf5 only as an optional dependency.
When installing hdf5 explicitly, opencv imports fine.

Additional info:
* package version(s)
Name : opencv
Version : 4.5.1-1
Description : Open Source Computer Vision Library
Architecture : x86_64
URL : https://opencv.org/
Licenses : BSD
Groups : None
Provides : None
Depends On : tbb openexr gst-plugins-base libdc1394 cblas lapack libgphoto2 openjpeg2 ffmpeg
Optional Deps : opencv-samples: samples
vtk: for the viz module
qt5-base: for the HighGUI module and the Python bindings [installed]
hdf5: for the HDF5 module and the Python bindings
opencl-icd-loader: For coding with OpenCL [installed]
python-numpy: Python bindings [installed]
java-runtime: Java interface [installed]

* config and/or log files etc.
* link to upstream bug report, if any
* Steps to reproduce:

1. enter python environment
2. try importing cv2:
>>> import cv2
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: libhdf5.so.200: cannot open shared object file: No such file or directory