tutorials/video_recorder: Added note about OGV support

[peci1]

🦟 Bug fix

Fixes https://github.com/gazebosim/gazebo_test_cases/issues/1312#issuecomment-2354141218

Summary

Added a note that OGV video format may not be supported on all platforms (Windows+Conda, e.g.).

Checklist

• [x] Signed all commits for DCO
• [ ] Added tests
• [x] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [ ] codecheck passed (See contributing)
• [ ] All tests passed (See test coverage)
• [ ] While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[ahcorde]

@osrf-jenkins run tests please!