Fix YouTube preview image

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improved accessibility to Kinect Video Preview in README.

📊 Key Changes

• Updated the link to the Kinect Video Preview image in the README file.

🎯 Purpose & Impact

• Purpose: To ensure the viewers can easily access and view the Kinect Video Preview, reflecting the repository's shift from 'master' to 'main' branch.
• Impact: Enhances user experience by providing direct and functional access to visual examples of the 3D scene reconstruction technology. This change is particularly beneficial for new visitors who are exploring the capabilities of the Ultralytics Kinect project, making it more inviting and informative. 📹✨