[FEATURE]: Education AI Suite - Settings modal window to select Video source and file upload for Smart Classroom sample app

Description Implement video input selection in the GUI, allowing users to:

• Upload video files (for demo and evaluation)
• Use real-time camera input (future enhancement or stretch goal)
• This enables testing of pose detection, ReID, and visual engagement features.

Assumptions

• File-based video input is preferred for October demos.
• Real-time camera input will be scoped for future releases.
• Video input feeds into CV pipelines

Dependencies

• CV pipelines (face detection, pose detection, ReID)
• GUI support for video file upload and camera access

Expected Output

• File upload interface for video
• Placeholder or toggle for camera input

Acceptance Criteria

• Users can upload video files via GUI
• Uploaded video is processed by CV pipelines
• Camera input is either functional or clearly marked as “Coming Soon”