From David Wood:

Most people don’t understand what’s going on in this video. It just seems like a Muslim shouting harsh words at our future President. But there’s much more to this video. Muslims are told to invite people to Islam. If people reject the invitation, Muslims are commanded to fight and kill them (unless they agree to pay the Jizya with the proper amount of humiliation and disgrace). This video, then, is an announcement of Step One–the invitation. When the invitation is refused, Muslims are called to violence.