This function can be used to set the default camera to use a custom camera that you have previously created using one of the camera_create functions. When you create a room with no active view ports or view cameras, GameMaker Studio 2 still uses a camera to show the action in the game. This camera is called the default camera and can be set and manipulated (and even destroyed) just like any other camera.
|camera_id||The unique camera ID value returned when you created the camera|
var new_cam = camera_create_view(0, 0, 640, 480, 0,
obj_Player, 5, 5, -1, -1);
The above code creates a new camera and then assigns it as the default camera to use.