With a live stream, it's generally not parallelizable at all. You won't have future frames to work with unless you add a huge delay in the stream, which generally doesn't mesh well with doing something live.
In any case, I wasn't referring to inter-frame parallelizability, I was referring to intra-frame parallelizability which doesn't require a delay.
Now, this works fine for large broadcasts where there is no two way communication between a streamer and their followers or in some type of competitive situations, but that is not the norm.