How do I make the camera attached to the head?

Ok so the guns in my place have a crouch and prone system, and they've been working fine until the update that made the camera attached to the HumanoidRootPart. Now whenever you crouch or go prone, the camera stays in the same place. I've seen litozinnamon's Call of Robloxia 5 - Dev Tests game have the same problem but he fixed it somehow, and I don't know how to fix it. Any suggestions?

Oh and here's the block of code that controls the prone and crouch system:

if Key == "c" then
	local LHip = Torso["Left Hip"]
	local RHip = Torso["Right Hip"]
	local Root = HRP.RootJoint
	if Stance == "Stand" or Stance == "Prone" then
		Stance = "Crouch"
		Humanoid.WalkSpeed = (Aimed and 6 or 8)
		LHip.C0 = CF(-1,-0.5,0) * CFANG(0,RAD(-90),0)
		LHip.C1 = CF(-0.5,0.5,1) * CFANG(0,RAD(-90),RAD(-90))
		RHip.C0 = CF(1,-0.5,0) * CFANG(RAD(-180),RAD(90),0)
		RHip.C1 = CF(0.5,0.5,1) * CFANG(RAD(-180),RAD(90),0)
		Root.C0 = CF(0,-1,0) * CFANG(RAD(-90),0,RAD(180))
		local Connection = nil
		Connection = Humanoid.Jumping:connect(function()
			if Stance == "Crouch" then
				onKeyDown("c")
			end
			Connection:disconnect()
		end)
	elseif Stance == "Crouch" then
		Stance = "Stand"
		Humanoid.WalkSpeed = (Aimed and 10 or 16)
		LHip.C0 = CF(-1,-1,0) * CFANG(0,RAD(-90),0)
		LHip.C1 = CF(-0.5,1,0) * CFANG(0,RAD(-90),0)
		RHip.C0 = CF(1,-1,0) * CFANG(RAD(-180),RAD(90),0)
		RHip.C1 = CF(0.5,1,0) * CFANG(RAD(-180),RAD(90),0)
		Root.C0 = CF() * CFANG(RAD(-90),0,RAD(180))
	end
end
if Key == "x" then
	local LHip = Torso["Left Hip"]
	local RHip = Torso["Right Hip"]
	local Root = HRP.RootJoint
	if Stance == "Stand" or Stance == "Crouch" then
		Stance = "Prone"
		Humanoid.WalkSpeed = (Aimed and 3 or 5)
		LHip.C0 = CF(-1,-1,0) * CFANG(0,RAD(-90),0)
		LHip.C1 = CF(-0.5,1,0) * CFANG(0,RAD(-90),0)
		RHip.C0 = CF(1,-1,0) * CFANG(RAD(-180),RAD(90),0)
		RHip.C1 = CF(0.5,1,0) * CFANG(RAD(-180),RAD(90),0)
		Root.C0 = CF(0,-2.5,0) * CFANG(RAD(180),0,RAD(180))
		Connection = Humanoid.Jumping:connect(function()
			if Stance == "Prone" then
				onKeyDown("x")
			end
			Connection:disconnect()
		end)
	elseif Stance == "Prone" then
		Stance = "Stand"
		Humanoid.WalkSpeed = (Aimed and 10 or 16)
		LHip.C0 = CF(-1,-1,0) * CFANG(0,RAD(-90),0)
		LHip.C1 = CF(-0.5,1,0) * CFANG(0,RAD(-90),0)
		RHip.C0 = CF(1,-1,0) * CFANG(RAD(-180),RAD(90),0)
		RHip.C1 = CF(0.5,1,0) * CFANG(RAD(-180),RAD(90),0)
		Root.C0 = CF() * CFANG(RAD(-90),0,RAD(180))
	end
end

P = script.Parent.Parent.Character.Head
T = Vector3.new(0,50,0)
cam.CoordinateFrame = CFrame.new(P.Position) * CFrame.new(0,0,7)
cam.CameraType = "Custom"

P is the head and I defined it a bit differently but you can define player yourself, find the head and you can use this script :P.

There is also another way to do it is by changing the camera subject, way more easier.

USE A LOCAL SCRIPT