Repository: opencv
Issue: Msvc compilation issue: member function does not override any base class virtual member function
Labels: invalid

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##### System information (version)
<!-- Example
- OpenCV => 4.5.5
- Operating System / Platform => 
- Compiler => Visual Studio 2019
-->

- OpenCV => 4.5.5
- Operating System / Platform => Windows 64 Bit
- Compiler =>Visual Studio 2019

##### Detailed description

I cannot compile my own code with OpenCv 4.5.5 and msvc flag /we4263 ('function' : member function does not override any base class virtual member function) due to BlocksCompensator contains this: https://github.com/opencv/opencv/blob/17234f82d025e3bbfbf611089637e5aa2038e7b8/modules/stitching/include/opencv2/stitching/detail/exposure_compensate.hpp#L189-L191 while ExposeCompensator contains this:
https://github.com/opencv/opencv/blob/17234f82d025e3bbfbf611089637e5aa2038e7b8/modules/stitching/include/opencv2/stitching/detail/exposure_compensate.hpp#L78-L79
so I have compiler error:
```
...\include\opencv2/stitching/detail/exposure_compensate.hpp(190): 
error C4263: 'void cv::detail::BlocksCompensator::feed(const std::vector<cv::Point,std::allocator<cv::Point>> &,const std::vector<cv::UMat,std::allocator<cv::UMat>> &,const std::vector<std::pair<cv::UMat,uchar>,std::allocator<std::pair<cv::UMat,uchar>>> &)': 
member function does not override any base class virtual member function
```
Looks like template in  BlocksCompensator  instantained with the same signature as a pure virtual member function in ExposeCompensator but it does not explicitly override this pure virtual func. I am not very familar with opencv codebase to submit fix.

##### Steps to reproduce

I have this error with including opencv header without using any opencv api

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