feat: Add indexing to camera simulator videos

[ejlee3]

Closes: #451

PR Checklist

• [x] Added label to the Pull Request for easier discoverability and search
• [x] Commit Message meets guidelines as indicated in the URL https://github.com/intel-retail/automated-self-checkout/blob/main/CONTRIBUTING.md
• [x] Every commit is a single defect fix and does not mix feature addition or changes
• [ ] Unit Tests have been added for new changes
• [x] Updated Documentation as relevant to the changes
• [ ] All commented code has been removed
• [ ] If you've added a dependency, you've ensured license is compatible with repository license and clearly outlined the added dependency.
• [ ] PR change contains code related to security
• [ ] PR introduces changes that breaks compatibility with other modules (If YES, please provide details below)

What are you changing?

Issue this PR will close

close: #451

Anything the reviewer should know when reviewing this PR?

Test Instructions if applicable

1. Delete downloaded videos in the sample-media folder.
2. change to the benchmark script dir cd benchmark-scripts
3. download the sample videos (either with or without the width, height, and fps ./download_sample_videos.sh
4. run the camera simulator
5. ensure that the indexes of the simulated cameras match the docs
6. run tests/pipelines/benchmarking as desired.

If the there are associated PRs in other repositories, please link them here (i.e. intel-retail/automated-self-checkout )