local camera = workspace.CurrentCamera
local blurAmount = 15 --Select your amount--
local blurAmplifier = 5 --If you know yk--
local lastVector = camera.CFrame.LookVector

local motionBlur = Instance.new("BlurEffect", camera)

local runService = game:GetService("RunService")

workspace.Changed:Connect(function(property)
 if property == "CurrentCamera" then
  print("Changed")
  local camera = workspace.CurrentCamera
  if motionBlur and motionBlur.Parent then
   motionBlur.Parent = camera
  else
   motionBlur = Instance.new("BlurEffect", camera)
  end
 end
end)

runService.Heartbeat:Connect(function()
 if not motionBlur or motionBlur.Parent == nil then
  motionBlur = Instance.new("BlurEffect", camera)
 end
 
 local magnitude = (camera.CFrame.LookVector - lastVector).magnitude
 motionBlur.Size = math.abs(magnitude)*blurAmount*blurAmplifier/2
 lastVector = camera.CFrame.LookVector
end)