Merge pull request #18535 from joshdoe:gray16_gstreamer_writing

Add CV_16UC1/GRAY16_LE support to GStreamer backend for VideoWriter

* videoio(backend): add Writer_open_with_params to plugin API

This will allow arbitrary parameters to be passed to plugin backends

* videoio(gstreamer): add GRAY16_LE/CV_16UC1 writing support to GStreamer

This introduces a new property VIDEOWRITER_PROP_DEPTH, which defaults to
CV_8U, but for GStreamer can be set to CV_16U.

Also, fix another test to not fail if plugin isn't found, copying logic
from the read_write test.

* videoio(plugin): fix handling plugins with previous API level

* videoio: coding style

* fix warning

modules/videoio/src/cap_ueye.cpp

@@ -467,7 +467,7 @@ CvResult CV_API_CALL cv_writer_write(CvPluginWriter /*handle*/, const unsigned c
 const OpenCV_VideoIO_Plugin_API_preview plugin_api_v0 =
 {
     {
-        sizeof(OpenCV_VideoIO_Plugin_API_preview), ABI_VERSION, API_VERSION,
+        sizeof(OpenCV_VideoIO_Plugin_API_preview), ABI_VERSION, 0/*API_VERSION*/,
         CV_VERSION_MAJOR, CV_VERSION_MINOR, CV_VERSION_REVISION, CV_VERSION_STATUS,
         "uEye OpenCV Video I/O plugin"
     },
@@ -482,7 +482,8 @@ const OpenCV_VideoIO_Plugin_API_preview plugin_api_v0 =
     /*  9*/cv_writer_release,
     /* 10*/cv_writer_get_prop,
     /* 11*/cv_writer_set_prop,
-    /* 12*/cv_writer_write
+    /* 12*/cv_writer_write,
+    /* 13 Writer_open_with_params*/NULL
 };
 } // namespace
 } // namespace cv