https://www.youtube.com/watch?v=dq8THlmD-vw
To use multiple cameras for a CGI (Computer-Generated Imagery) project, you can follow these general steps:

Camera Placement:

Strategically position each physical camera in your real-world setup to capture different perspectives of the scene.
Calibration:

Ensure all cameras are calibrated to have consistent settings, such as focal length, exposure, and white balance. This helps in seamless blending of CGI elements.
Syncing:

Synchronize the timing of all cameras to capture frames simultaneously. This is crucial for accurate alignment during post-production.
Data Management:

Organize and label footage from each camera properly for easy identification during the editing process.
Scene Tracking:

Use tracking markers or feature points in the real-world scene to assist in aligning CGI elements with the live footage later on.
Post-Production:

Bring all camera footage into your CGI software (e.g., Blender, Maya, or others).
Align the footage using the tracking data to match the CGI elements with the live action.
Compositing:

Blend the CGI elements seamlessly with the live footage using compositing techniques. Pay attention to lighting, shadows, and reflections to enhance realism.
Color Grading:

Ensure a consistent color grade across all footage to maintain visual coherence.
Rendering:

Render the final composite with all the integrated CGI elements.
Review and Adjust:

Review the final output and make necessary adjustments to achieve the desired look.
Remember that the specifics can vary based on the software you're using and the complexity of your CGI project.