Cut hole though centre of shader on camera

Hi, Is it possible to cut/put a hole through the centre of a shader effect applied to the camera so I can see through? I purchased the Camera Filter Pack from the asset store while its on sale and I'm using the **CameraFilterPack_FX_Hexagon_Black** effect and would like to put a hole through it faded at the edges if possible, as I have no clue about writing shaders any help, advice would be appreciated, thanks.