[Doc] Add Custom Options for VideoRecorder

[N00bcak]

Description

• Add the ability to specify FFmpeg kwargs for torchrl.record.VideoRecorder
• Added notes to knowledge base on how to find FFmpeg kwargs and apply them to VideoRecorders
• Made said notes accessible by linking knowledge base on the "Get started with logging" page

Motivation and Context

Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.
You can use the syntax close #15213 if this solves the issue #15213

close #2258

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

What types of changes does your code introduce? Remove all that do not apply:

• New feature (non-breaking change which adds core functionality)
• Documentation (update in the documentation)

Checklist

Go over all the following points, and put an x in all the boxes that apply.
If you are unsure about any of these, don't hesitate to ask. We are here to help!

• I have read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2259

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 5 New Failures, 1 Unrelated Failure

As of commit 48d8855 with merge base ba6897d ():

NEW FAILURES - The following jobs have failed:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Workflow failed! Resource not accessible by integration
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  Workflow failed! Resource not accessible by integration
• Habitat Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t c1e502b5f75fd965a64823b2dfce266f5dba795414b35bb1e850bbb62bdd8048 /exec failed with exit code 139
• RLHF Tests on Linux / unittests (3.9, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t 12f6e68ce8212b5910ea4a68aef546e87d03adc3a455f98b54d49f33f4be78ac /exec failed with exit code 1
• Unit-tests on Linux / tests-optdeps (3.10, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t 31af45dae84709fe207d69232e6a7d8157757237f6861434e6ff969ba76b05b5 /exec failed with exit code 1

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Unit-tests on Windows / unittests-cpu / windows-job (gh) (trunk failure)
  test/test_transforms.py::TestActionDiscretizer::test_trans_parallel_env_check[False]

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[vmoens]

@N00bcak I made a couple of edits, can you give it a look?

[N00bcak]

yep, looks good to me!

[vmoens]

@N00bcak if you look at the examples CI we still have an issue with duplicated args, can you have a look at that?