System Information

OpenCV version: 4.5.5 & 4.7.0
Operating System / Platform: Ubuntu 22.04
Compiler & compiler version: GCC 11.3.0

Detailed description

CMakeLists.txt examples of samples/cpp/tutorial_code/core/parallel_backend is missing project(...) marker. The compilation fails :

CMake Error at /usr/share/cmake-3.22/Modules/FindOpenMP.cmake:615 (message):
  FindOpenMP requires the C, CXX or Fortran languages to be enabled
Call Stack (most recent call first):
  CMakeLists.txt:8 (find_package)

Steps to reproduce

cd samples/cpp/tutorial_code/core/parallel_backend
mkdir build
cd build
cmake .. -DCMAKE_PREFIX_PATH=...opencv_installpath...

Issue submission checklist

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