There is someone in the wall behind the poster.
The picture of the burger is a well-concealed cut out which can be pulled back into the wall, then a burger is stuffed through the hole and the guy grabs it.
When his hands are in the magic burger making mode you will notice that the camera can't see the burger picture anymore. Once the real burger is in his hands, a different burger picutre (the blank one) is shoved into place.
If the poster wasn't attached to a building the trick would be much more impressive.
But again, the trick is in controlling the angle of sight. You are never allowed to see the space between the guy's burger hands and the wall while the magic is happening.