How would I blur the camera from a localscript?

I am making a blur effect come on the background on my GUI. I works when I do it with in a different screen gui but on this one. I get no error in the output either. I don't know what to do.

local collectionservice = game:GetService("CollectionService")
local openUIEvent = game:GetService("ReplicatedStorage").RemoteEvents:WaitForChild("OpenMissionUI")
local bricks = script.Parent:WaitForChild("Bricks")
local debounce = false
local camera = workspace.CurrentCamera

for i,v in pairs(collectionservice:GetTagged("MissionDetectors"))do
    v.Touched:Connect(function(hit)
        if debounce == false then
            debounce = true
            if hit.Parent:FindFirstChild("Humanoid")then
                local player = game:GetService("Players"):GetPlayerFromCharacter(hit.Parent)
                openUIEvent:FireClient(player)
                hit.Parent.Humanoid.WalkSpeed = 0
                hit.Parent.Humanoid.JumpPower = 0
                local blur = Instance.new("BlurEffect",camera)
                blur.Name = "MissionBlur"
                blur.Size = 13  
                wait(3)
                debounce = false
                end
        end
    end)
end