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