If you can't find a specific hack for this machine then the next step will be to try and get hold of a rooted firmware and burn that. This of course is the ultimate 'clean install' and, as usual, the warning is that the incorrect firmware or a problem during burning might brick the hardware. Searching on Google for 'minix 8h rooted firmware' is a good place to start.
I keep asking about your reason to root this box because there should be no need for you to do so just to be able to use an add-on to watch a video stream. I don't know the box so unless rooting it 'unlocks' something specific to what you need to be able to view these streams then I would leave well alone. If you want to confirm this with others with more knowledge of this box then it might be worthwhile posting a message along the lines of "Do I need to root my Minix in order to watch streams reliably" and see what the advice is.