Adding a freecam mode for trailers in my roblox game

You might not need to build one. Roblox already has a developer freecam: Shift+P in a live server toggles it, as long as you have edit rights on the game (owner, or a group role with edit permission). WASD to move, right mouse to look, Q and E for height. For actual trailer shots I'd still script it though. Set the camera's CameraType to Scriptable, drop a few invisible parts as waypoints, and tween the camera CFrame between them. Handheld freecam footage always comes out a bit jittery, tweened paths look much cleaner.