Merge pull request #20785 from smirnov-alexey:as/oak_backend

GAPI: Add OAK backend

* Initial tests and cmake integration

* Add a public header and change tests

* Stub initial empty template for the OAK backend

* WIP

* WIP

* WIP

* WIP

* Runtime dai hang debug

* Refactoring

* Fix hang and debug frame data

* Fix frame size

* Fix data size issue

* Move test code to sample

* tmp refactoring

* WIP: Code refactoring except for the backend

* WIP: Add non-camera sample

* Fix samples

* Backend refactoring wip

* Backend rework wip

* Backend rework wip

* Remove mat encoder

* Fix namespace

* Minor backend fixes

* Fix hetero sample and refactor backend

* Change linking logic in the backend

* Fix oak sample

* Fix working with ins/outs in OAK island

* Trying to fix nv12 problem

* Make both samples work

* Small refactoring

* Remove meta args

* WIP refactoring kernel API

* Change in/out args API for kernels

* Fix build

* Fix cmake warning

* Partially address review comments

* Partially address review comments

* Address remaining comments

* Add memory ownership

* Change pointer-to-pointer to reference-to-pointer

* Remove unnecessary reference wrappers

* Apply review comments

* Check that graph contains only one OAK island

* Minor refactoring

* Address review comments

modules/gapi/cmake/init.cmake

@@ -1,7 +1,8 @@
 OCV_OPTION(WITH_ADE "Enable ADE framework (required for Graph API module)" ON)
 
-OCV_OPTION(WITH_FREETYPE "Enable FreeType framework" OFF)
-OCV_OPTION(WITH_PLAIDML  "Include PlaidML2 support"  OFF)
+OCV_OPTION(WITH_FREETYPE "Enable FreeType framework"     OFF)
+OCV_OPTION(WITH_PLAIDML  "Include PlaidML2 support"      OFF)
+OCV_OPTION(WITH_OAK      "Include OpenCV AI Kit support" OFF)
 
 if(NOT WITH_ADE)
   return()
@@ -39,3 +40,10 @@ if(WITH_GAPI_ONEVPL)
         set(HAVE_GAPI_ONEVPL TRUE)
     endif()
 endif()
+
+if(WITH_OAK)
+  find_package(depthai QUIET)
+  if(depthai_FOUND)
+      set(HAVE_OAK TRUE)
+  endif()
+endif()