fix: webcam not allowed and image is empty

[mikaelkurek]

This PR fixes an issue with the Camera if there is no authorization to access it.

Description

When the authorization for the Camera is forbidden, a video tag is detected but the lib crashes. To avoid this crash, I create an empty image.

Motivation and Context

Fix an issue when the camera is not allowed or when a video source is empty and there is no poster.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Enhancement (changes that improvement of current feature or performance)
• Refactoring (changes that neither fixes a bug nor adds a feature)
• Test Case (changes that add missing tests or correct existing tests)
• Code style optimization (changes that do not affect the meaning of the code)
• Docs (changes that only update documentation)
• Chore (changes that don't modify src or test files)

Self Check before Merge

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[nicolas-daures]

Impec