fix(enjoy): restore --capture-video argument removed in #424

[mturan33]

Description

cleanrl_utils/enjoy.py references args.capture_video at line 42 but the corresponding argparse definition was removed during the tyro refactor in #424 — despite the PR's name, enjoy.py was never actually migrated to tyro and remained on raw argparse. As a result, any python -m cleanrl_utils.enjoy ... invocation crashes with AttributeError: 'Namespace' object has no attribute 'capture_video' immediately after the HuggingFace Hub model download succeeds.

This PR restores the --capture-video flag using the exact same pattern as the training scripts (cleanrl/ppo.py, cleanrl/ddpg_continuous_action.py, cleanrl/sac_continuous_action.py): action="store_true", default False, byte-identical help text.

It also corrects --capture_video → --capture-video in docs/get-started/CleanRL_Huggingface_Integration_Demo.ipynb (two occurrences). argparse does not normalize underscores to hyphens, so the documented command in the notebook would have failed even after the Python fix.

Verification

Reproduced the original crash on master: AttributeError: 'Namespace' object has no attribute 'capture_video'

After the fix:

• python -m cleanrl_utils.enjoy --env-id CartPole-v1 --exp-name dqn --eval-episodes 1 → args.capture_video = False
• python -m cleanrl_utils.enjoy --env-id CartPole-v1 --exp-name dqn --eval-episodes 1 --capture-video → args.capture_video = True
• python -m cleanrl_utils.enjoy --help → now lists --capture-video with the correct help text

Note: I used --exp-name dqn for repro because ppo is not a registered key in cleanrl_utils/evals/__init__.py. The argparse-level fix is exp-name-independent.

Out of scope (worth flagging separately)

• enjoy.py is the last cleanrl_utils/ module still on raw argparse. A full tyro migration would be cleaner long-term but is intentionally not bundled here — mixing a refactor with a regression fix complicates review.
• tests/test_enjoy.py exists but is not wired into any CI workflow and its commands are malformed (python enjoy.py --env ... instead of python -m cleanrl_utils.enjoy --env-id ...). This is why the regression went uncaught for ~15 months. Happy to open a separate issue for this.

Closes #497

Types of changes

• Bug fix

Checklist:

• I've read the CONTRIBUTION guide (required).
• I have ensured pre-commit run --all-files passes (required).
• No behavioral changes for users who don't pass --capture-video (default False matches pre-Refactor to use tyro #424 behavior).

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