Video doesn't seem to work. Could you upload it to youtube then post a link here? I'd like to see if this is really what's going on.
If it is, I wouldn't worry about it. I've had this sort of thing happen before, and while it is uncomfortable and stressful for the fish, it is hardly ever life-threatening. Eventually the pellet will soften and the fish will either spit it out or swallow it. Any attempt to intervene will probably do more damage than good.
That said, if this is happening, you might consider switching to smaller pellets or flakes. This sort of thing is one of the reasons I tend to prefer flakes (along with small freeze-dried or frozen foods) for most fish, especially smaller ones.