Camera can be zoomed with the scroll wheel. Position smoothing enabled.

Scenes/Camera/camera_controller.gd

@@ -15,3 +15,8 @@ func _process(delta: float) -> void:
 		global_position += Vector2.LEFT * 2
 	if Input.is_action_pressed("MoveRight"):
 		global_position += Vector2.RIGHT * 2
+		
+	if Input.is_action_just_released("ZoomIn"):
+		$SmartCamera2D.zoom += Vector2.ONE
+	if Input.is_action_just_released("ZoomOut"):
+		$SmartCamera2D.zoom -= Vector2.ONE

Scenes/Camera/camera_controller.tscn

@@ -9,6 +9,7 @@ script = ExtResource("1_ig7ij")
 metadata/_edit_group_ = true
 
 [node name="SmartCamera2D" type="Camera2D" parent="."]
+position_smoothing_enabled = true
 script = ExtResource("2_du7i2")
 target = NodePath("..")
 metadata/_custom_type_script = "uid://xrddv2epi3ty"