Camera Script For Over View Will Not Work Right, Will Not Move Camera With CameraPart??

Hello, use this script, it is made by ultraw and modified by me, press q and e to change camera zoom, press wasd or arrow keys to move camera, and press i and o to zoom up and down here is the script:

cameraAngle = 30
studs = 700 
StudsY = 395
wait(.5)

a = false
b = false
local player = game.Players.LocalPlayer
local uIP = game:GetService("UserInputService")
local cam = game.Workspace.CurrentCamera
local debounce = false
local loc = nil

local q local rs local input local output local die
function addInput(inputObject,gPE)
if not gPE then
    if inputObject.KeyCode == Enum.KeyCode.Up then  
        movement = movement + Vector3.new(0,0,-5)
    elseif inputObject.KeyCode == Enum.KeyCode.Left then
        movement = movement + Vector3.new(-5,0,0)
    elseif inputObject.KeyCode == Enum.KeyCode.Down then    
        movement = movement + Vector3.new(0,0,5)
    elseif inputObject.KeyCode == Enum.KeyCode.Right then
        movement = movement + Vector3.new(5,0,0)
    elseif inputObject.KeyCode == Enum.KeyCode.O then
        movement = movement + Vector3.new(0,3,0)
    elseif inputObject.KeyCode == Enum.KeyCode.I then
        movement = movement + Vector3.new(0,-3,0)
    elseif inputObject.KeyCode == Enum.KeyCode.Q then
        repeat
            b=false
        cameraAngle = cameraAngle + 1
        if cameraAngle > 80 then
            b = true
        end
        wait()
        until b == true
    elseif inputObject.KeyCode == Enum.KeyCode.E then
        repeat
            a=false
            if cameraAngle < 10 then
                a = true
            end
        cameraAngle = cameraAngle - 1
        wait()
        until a == true
    elseif inputObject.KeyCode == Enum.KeyCode.W then   
        movement = movement + Vector3.new(0,0,-5)
    elseif inputObject.KeyCode == Enum.KeyCode.A then
        movement = movement + Vector3.new(-5,0,0)
    elseif inputObject.KeyCode == Enum.KeyCode.S then   
        movement = movement + Vector3.new(0,0,5)
    elseif inputObject.KeyCode == Enum.KeyCode.D then
        movement = movement + Vector3.new(5,0,0)
end     
end
end

function endInput(inputObject,gPE)
if not gPE then
if inputObject.KeyCode == Enum.KeyCode.Up then  
    movement = movement + Vector3.new(0,0,5)
elseif inputObject.KeyCode == Enum.KeyCode.Left then
    movement = movement + Vector3.new(5,0,0)
elseif inputObject.KeyCode == Enum.KeyCode.Down then    
    movement = movement + Vector3.new(0,0,-5)
elseif inputObject.KeyCode == Enum.KeyCode.Right then
    movement = movement + Vector3.new(-5,0,0)   
elseif inputObject.KeyCode == Enum.KeyCode.W then   
    movement = movement + Vector3.new(0,0,5)
elseif inputObject.KeyCode == Enum.KeyCode.A then
    movement = movement + Vector3.new(5,0,0)
elseif inputObject.KeyCode == Enum.KeyCode.S then   
    movement = movement + Vector3.new(0,0,-5)
elseif inputObject.KeyCode == Enum.KeyCode.D then
    movement = movement + Vector3.new(-5,0,0)
elseif inputObject.KeyCode == Enum.KeyCode.O then
    movement = movement + Vector3.new(0,-3,0)
elseif inputObject.KeyCode == Enum.KeyCode.I then
    movement = movement + Vector3.new(0,3,0)
    elseif inputObject.KeyCode == Enum.KeyCode.Q then
        repeat
            b=true
        cameraAngle = cameraAngle -1
        wait()
        until b == true
    elseif inputObject.KeyCode == Enum.KeyCode.E then
        repeat
            a=true
        cameraAngle = cameraAngle +1
        wait()
        until a == true
end
end
end

function render()
    local m = studs
    local b = StudsY
    local XA =(ovr.X+movement.X)
    local XB = (ovr.Z+movement.Z)
    local XC = (ovr.Y+movement.Y)
    local mX = movement.X
    local mZ = movement.Z
    local mY = movement.Y
    if not(XA<m and XA>-m) then mX=0 end
    if not(XB<m and XB>-m) then mZ=0 end
    if not(XC<b and XC>-b) then mY=0 end
    local rV = Vector3.new(mX,mY,mZ)
    ovr = ovr + rV
    loc = loc * CFrame.new(rV)
    cam.CoordinateFrame = loc * CFrame.Angles(math.rad(-cameraAngle),0,0)
end


function setCam(block)
ovr = Vector3.new(0,0,0)
loc = block.CFrame
cam.CameraType = Enum.CameraType.Scriptable 
movement = Vector3.new(0,0,0)
input = uIP.InputBegan:connect(addInput)
output = uIP.InputEnded:connect(endInput)   
rs = game:GetService("RunService").--[[Render????]]Stepped:connect(render)
if uIP:IsKeyDown(Enum.KeyCode.Up) then
    movement = movement + Vector3.new(0,0,-1)
end
if uIP:IsKeyDown(Enum.KeyCode.Left) then
    movement = movement + Vector3.new(-1,0,0)
end
if  uIP:IsKeyDown(Enum.KeyCode.Down) then   
    movement = movement + Vector3.new(0,0,1)
end
if  uIP:IsKeyDown(Enum.KeyCode.Right) then
    movement = movement + Vector3.new(1,0,0)
end 
if  uIP:IsKeyDown(Enum.KeyCode.E) then
    repeat
        cameraAngle = cameraAngle -1
        wait()
        until a == true
end 
if  uIP:IsKeyDown(Enum.KeyCode.Q) then
    repeat
        cameraAngle = cameraAngle +1
        wait()
        until b == true
end 
end

function quit()
    debounce = false
    if rs then rs:disconnect() end
    if input then input:disconnect() end
    if output then output:disconnect() end
    if q then q:disconnect() end

    local char = player.Character
    if char then
        cam.CameraSubject = char.Humanoid
    end
end


function start(block,character)
    cam.CameraType = Enum.CameraType.Scriptable
    setCam(block)
end


repeat wait() until player.Character and player.Character.Parent
            start(workspace.CameraPart,player.Character)

localscript in StarterPlayerScripts