System information (version)

• OpenCV => 4.4
• Operating System / Platform => Windows 64 Bit
• Compiler => Visual Studio 2017

Detailed description

It would be very helpful, if it would be possible to get and set the cameras_ array on Stitcher. That way you could call estimateTransform, get the cameras, and save for later or repeated use.

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  answers.opencv.org, Stack Overflow, etc and have not found solution
• I updated to latest OpenCV version and the issue is still there
• There is reproducer code and related data files: videos, images, onnx, etc