That is completely LEGAL.

So says the NFL rulebook:

The snap (3-32) may be made by any offensive player who is on the line but must conform to the following provisions:

(a) The snap must start with ball on ground with its long axis horizontal and at right angles to line, and

(b) The impulse must be given by one quick and continuous motion of hand or hands of snapper. The ball must actually leave or be taken from his hands during this motion.

(c) The snapper may not:

(1) move his feet abruptly from the start of snap until the ball has left his hands;

(2) have quick plays after the neutral zone starts if the officials have not had a reasonable time to assume their normal stances.

Another trick play is this one:

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