Well…you could just use the shatter effect on the footage at the same time the footage of glass is being shattered.. OR you could even try using the luma matte of the shatter in the displacement map. and then set the displacement at llike 100. this doesnt actually do much, but it kinda works…Or if you have element 3d you could definitely do this using voronoi shatter..but it takes some practice to make it look good