Uninstall opencv included in base image (#7626)

Fixes [tutorial
#1689](Project-MONAI/tutorials#1689)

### Description

Uninstall opencv included in base image.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

---------

Signed-off-by: YunLiu <55491388+KumoLiu@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: KumoLiu

Dockerfile

@@ -22,6 +22,9 @@ RUN git clone --recursive https://github.com/zarr-developers/numcodecs.git && pi
 
 WORKDIR /opt/monai
 
+# remove opencv-python before opencv-python-headless installation
+RUN pip uninstall -y opencv && rm /usr/local/lib/python3.10/dist-packages/cv2 -r
+
 # install full deps
 COPY requirements.txt requirements-min.txt requirements-dev.txt /tmp/
 RUN cp /tmp/requirements.txt /tmp/req.bak \

monai/data/video_dataset.py

@@ -177,7 +177,7 @@ def get_available_codecs() -> dict[str, str]:
             with tempfile.TemporaryDirectory() as tmp_dir:
                 for codec, ext in all_codecs.items():
                     fname = os.path.join(tmp_dir, f"test{ext}")
-                    fourcc = cv2.VideoWriter_fourcc(*codec)
+                    fourcc = cv2.VideoWriter_fourcc(*codec)  # type: ignore[attr-defined]
                     noviderr = writer.open(fname, fourcc, 1, (10, 10))
                     if noviderr:
                         codecs[codec] = ext

requirements-dev.txt

@@ -57,3 +57,4 @@ zarr
 lpips==0.1.4
 nvidia-ml-py
 huggingface_hub
+opencv-python-headless