I want to develop a browser plugin for RTSP streaming on web browser, I read about NPAPI, which can execute native code(C++). But Google Chrome will not support NPAPI in future and no guaranty about Firefox also.
Please somebody can suggest me to "How can I develop plugin which can execute native code(OR any other language) using other framework instead of NPAPI?".
How can I add RTSP Streaming support for web browsers?
I'm afraid you cannot implement universal plugin at the moment. It's possible to write extensions for Chrome and Firefox which support TCP and UDP sockets (Chrome API, Mozilla API ). No such thing for Microsoft Edge or Explorer or Safari as far as I know.
If using different streaming protocol is an option, consider WebRTC. Its support is still not very good, but at least WebRTC is an official standard and has better chances of being adopted.