Post Process Material not lining up with camera

I’m trying to get a camera to show a custom overlay using a post process material to help me with compostion of my scenes. I found this video that shows exactly what I would like to achieve.

I can’t seem to figure out why the post process material I have attached to my camera won’t show up properly. I don’t think it has anything to do with the material itself since no matter what I plug into the blendable (under Misc of the camera itself) it doesn’t show the way I want it to. It kind of looks like the texture is just stretched too large. Is there a way to make the texture I have fit perfectly with the camera view?

This is what I’m seeing:

http://i.imgur.com/5RUugcx.png

This is what I’m aiming for (doctored in Photoshop to include the overlay):

http://i.imgur.com/ykswXb4.png

Use ScreenAlignedUVs function for the UV input of your texture inside the material.

Yes that worked, thanks! I knew it was something simple I was missing.