No, you can use it like your box blur. Itīs just an other kernel and happily separable too. For a 7x7 blur you can try these weights: float gauss1D_weights2[7]={0.015f,0.083f,0.235f,0.332f,0.235f,0.083f,0.0015f}; but you can compute your own of course, depending on the width and falloff you prefer. Not much effort as you can see.
Just give it a try. You'll notice that your bloom fates out more smoothly.
