Framework for dynamic videoio backends, FFmpeg and GStreamer plugins

modules/videoio/include/opencv2/videoio/registry.hpp

@@ -38,6 +38,16 @@ CV_EXPORTS_W std::vector<VideoCaptureAPIs> getStreamBackends();
 /** @brief Returns list of available backends which works via `cv::VideoWriter()` */
 CV_EXPORTS_W std::vector<VideoCaptureAPIs> getWriterBackends();
 
+enum Capability
+{
+    Read,
+    Write,
+    ReadWrite
+};
+
+/** @brief Returns true if backend is available */
+CV_EXPORTS bool hasBackend(VideoCaptureAPIs api, Capability cap = ReadWrite);
+
 //! @}
 }} // namespace