Well, no, it hasn't.
I'm aware of two bits of fan footage from behind the goal umpire - one in which the ball partially disappears out of frame at a crucial point and is thus then useless (though it didn't stop Channel 7 running it with the caption that "this shows once and for all the umpire was wrong"), and the other which appears to show it actually did graze the post, though being phone footage, the resolution is not good enough to say for sure.
But no official footage could be classed as definitive.
Where's the image you say it grazed the post?
I gather some people think it grazed the top of the padding? So here's the comparison between the fan shot where the ball can still be seen in frame and the AFL view. Both are approx the same height, the AFL view shows the ball well past the padding at this height, so it's only going to be further away at padding height, it was never close to the actual post, not even a shadow.