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Port G-API demos to API2.0 - background_subtraction_demo/cpp_gapi #3903
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Port G-API demos to API2.0 - background_subtraction_demo/cpp_gapi #3903
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      | with: | ||
| repository: opencv/opencv | ||
| path: cache/opencv | ||
| name: Clone and checkout OpenCV | 
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To test this PR in OpenCV : opencv/opencv#24938.
Will be removed.
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To also test this PR in OpenCV : opencv/opencv#25508.
Will be removed.
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           This PR should be merged after this one opencv/opencv#24938.  | 
    
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Ticket:
103104
Description:
G-API Background Subtraction Demo, Classification Benchmark C++ G-API Demo, G-API Gaze Estimation Demo and other - fail on NPU with the following error:
dynamic shape issuesConclusion: We need to port the G-API demos to API2.0 to make them work.
Affected demos:
[ ERROR ] OpenCV(4.8.0-dev) ..\modules\gapi\src\backends\ov\govbackend.cpp:799: error: (-215:Assertion failed) cv::util::holds_alternativecv::GMatDesc(input_meta) in function 'cv::gimpl::ov::PrePostProcWrapper::cfgPreProcessing' - WIP
Also needs the following change to be merge to OpenCV repo: