I am heading into problems?

So, I started of think to make a "3-rd Person Camera" So I taught of using my 2D Script and convert it into a 3rd person camera script. So here's the problem I face.

I am not able to make the camera to always look at the head of my character using lookVectors.. Please help me

Script given below...

-- by udayk8139 
	game.StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.All, false)
	game.StarterGui:SetCoreGuiEnabled(Enum.CoreGuiType.Chat, true)
	plr = game.Players.LocalPlayer
	repeat wait() until plr.Character
	local cam = game.Workspace.CurrentCamera
	local char = plr.Character
	local p = char.Torso
	
	---------------------------------------------------
	local campart = Instance.new("Part", plr.Character)
	campart.Name = "Cam"
	campart.Anchored = false
	--campart.CanCollide = false
	campart.Transparency = 1
	local bp = Instance.new("BodyPosition", campart)
	bp.maxForce = Vector3.new(40000000, 40000000, 40000000)
	local bg = Instance.new("BodyGyro", campart)
	bg.maxTorque = Vector3.new(400000, 400000, 400000)
	
	-------------------------------------------------------
	
	cam.CameraType = Enum.CameraType.Scriptable
	cam.Focus = p.CFrame
	cam.FieldOfView = 80
	
	-------------------------------------------------------
	game:GetService('RunService').RenderStepped:connect(function()
		bp.position = Vector3.new(p.CFrame.x, p.CFrame.y + 10, p.CFrame.z + 10) 
		campart.CFrame.lookVector = p.Position
		cam.CoordinateFrame = campart.CFrame
	end)
	

-- by udayk8139 

lookVector is a read-only value. You can use body gyro to make it face the character.

--...
game:GetService('RunService').RenderStepped:connect(function()
        bp.position = Vector3.new(p.CFrame.x, p.CFrame.y + 10, p.CFrame.z + 10) 
        bg.cframe = CFrame.new(campart.Position, p.Position) --CFrame.new(Vector3 position, Vector3 point): takes a position and point and returns a CFrame at position rotated towards point
        cam.CoordinateFrame = campart.CFrame
end)