GoPro 6 for live stitching

Does somebody try to use GoPro6 to do the live stitching and streaming (for example, to YouTube)? As far as I know, we can use the unofficial API to get the video stream from the GoPro. But in this case, we cannot upload the video. Currently, I try to get the video stream using HDMI capture card (convert HDMI to USB), however, it doesn’t work. question is the same as in the post below: