Add zooming on trackpad

[keyaloding]

Description

Right now, the SLEAP GUI does not allow the user to zoom in on a video using the pinch gesture on their trackpad. This PR will add this feature so that trackpad users can zoom in or out.

Types of changes

• [ ] Bugfix
• [x] New feature
• [ ] Refactor / Code style update (no logical changes)
• [ ] Build / CI changes
• [ ] Documentation Update
• [ ] Other (explain)

Does this address any currently open issues?

1528

Outside contributors checklist

• [ ] Review the guidelines for contributing to this repository
• [ ] Read and sign the CLA and add yourself to the authors list
• [ ] Make sure you are making a pull request against the develop branch (not main). Also you should start your branch off develop
• [ ] Add tests that prove your fix is effective or that your feature works
• [ ] Add necessary documentation (if appropriate)

Thank you for contributing to SLEAP!

:heart:

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 22.85714% with 27 lines in your changes missing coverage. Please review.

Project coverage is 74.32%. Comparing base (7ed1229) to head (584c3ca). Report is 29 commits behind head on develop.

Files	Patch %	Lines
sleap/gui/widgets/video.py	22.85%	27 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1867 +/- ## =========================================== + Coverage 73.30% 74.32% +1.01% =========================================== Files 134 135 +1 Lines 24087 24811 +724 =========================================== + Hits 17658 18441 +783 + Misses 6429 6370 -59 ```

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