feat: Implemented a Mock Interview Video Recording and AI Body Language Analysis feature (#2299)

[Aakif-Kohari]

📝 Pull Request Description

Related Issue

Closes #2299

Summary

Implemented a Mock Interview Video Recording and AI Body Language Analysis feature. Users can now record themselves directly in the browser using the MediaRecorder API. The video is securely uploaded and processed by an AI pipeline (simulated for this PR) to provide actionable feedback on eye contact, filler word usage, and speaking pace, alongside a full transcript.

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Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature
• ♻️ Refactoring
• 📝 Documentation update
• 🎨 UI/UX improvement
• 🔥 Other(please describe) ______

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How Has This Been Tested?

• Granted browser camera/microphone permissions and verified video recording starts and stops correctly.
• Uploaded a recorded video and verified the backend accepts it, validates the MIME type/size, and returns a processing status.
• Verified the frontend polls for results and displays the final AI feedback dashboard with correct score color coding.

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Checklist

• My code follows the project's guidelines
• I have tested my changes
• I have updated documentation where necessary
• I have linked the related issue
• My changes do not introduce new warnings or errors

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📥 Commits

Reviewing files that changed from the base of the PR and between ecb5cef and b7c2724.

📒 Files selected for processing (5)

• backend/controllers/videoAnalysisController.js
• backend/models/VideoAnalysis.js
• backend/routes/videoAnalysisRoutes.js
• frontend/src/components/VideoRecorder.jsx
• frontend/src/pages/VideoInterview/VideoPlaybackAnalyzer.jsx

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[github-actions]

Thank you for submitting your pull request, @Aakif-Kohari! 🙌
We'll review it as soon as possible.
If there are any specific instructions or feedback regarding your PR, we'll provide them here.
Thanks again for your contribution to our project! 😊

[Aakif-Kohari]

Please try to add many Bonus XP tags (good-issue, good-pr, good-ui, good-backend) before merge.🙏

[github-actions]

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