Merge pull request #15100 from Volskig:cam_multiplexing_function_v

Implement Camera Multiplexing API

* IdideoCapture + two wrong function

function waitAny

Add errors catcher

Stub for Python added.

Sifting warnings

One test added

Two tests for camera and Perf tests added

* Perf sync and async tests for waitAny() added, waitAnyInterior() deleted, getDeviceHandle() deleted

* Variable OPENCV_TEST_CAMERA_LIST added

* Without fps set

* ASSERT_FAILED for environment variable

* Perf tests is DISABLED_

* --Trailing whitespace

* Return false from cap.cpp deleted

* Two functions deleted from interface, +range for, +environment variable in test_camera

* Space deleted

* printf deleted, perror added

* CV_WRAP deleted, cv2 cleared from stubs

* -- space

* default timeout added

* @param changed

* place of waitAny changed

* --whitespace

* ++function description

* function description changed

* revert unused changes

* videoio: rework API for VideoCapture::waitAny()

modules/videoio/perf/perf_input.cpp

@@ -3,6 +3,8 @@
 // of this distribution and at http://opencv.org/license.html
 #include "perf_precomp.hpp"
 
+#include "perf_camera.impl.hpp"
+
 namespace opencv_test
 {
 using namespace perf;