capture stream

hi, I am wondering if there is a API for capturing stream inside jwplayer. I can capture the stream from jwplayer with getting the video element which jwplayer creates it and apply captureStream method to video element. it works in chrome but not firefox do you have any API for this purpose? you can find sample code on stackoverflow https://stackoverflow.com/questions/45363524/capturestream-on-dynamically-created-video-element thanks