camera manipulation in server script?

with Filtering Enabled on which I'm guessing you're using, as you haven't stated otherwise. You want to use a remote function in ReplicatedStorage

This is the Server script.

local this = script.Parent.Parent.detector
local db = false
local remoteEvent = game:GetService("ReplicatedStorage"):FindFirstChild("RemoteEvent")
--[[ 
ReplicatedStorage is the gateway between the client and the server, it's where

you want to store your remote events 
--]]

this.Touched:connect(function(hit)

        if hit.Parent:FindFirstChild("Humanoid") ~= nil then
        local player = game:GetService("Players"):GetPlayerFromCharacter(hit.Parent)
        remoteEvent:FireClient(player,this.Parent.Parent.camparts.cam1.CFrame,this.Parent.Parent.camparts.cam1)
        --[[ 
        Get the player from the character, then fire the remote event, you need the player

        so that the remoteEvent knows which player triggered the event.
        --]]
    end

    -- Create a camera change, a close button to that and a way to detect if the shop is open, Be Patient :) it will take a while --

end)

Local Script

You can put this in the StarterGui

script.Parent.RemoteEvent.OnServerEvent:Connect(function(player, positioning, subject)

    local char = hit.Parent
    local plr = game:GetService("Players").LocalPlayer
    local cam = game.Workspace.CurrentCamera
    cam.CFrame = positioning
    cam.CameraType = Enum.CameraType.Scriptable
    cam.CameraSubject = subject

end)