have you seen the camera tricks demo? If not click New+ in GS and search camera tricks. Double click it to edit.
It has a zoom in and out (and others). Note there is a camera control actor below the scene that has all the control code and I believe you need to click on it in the scene to see this.
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Look at the menu. Click the camera icon
It has a zoom in and out (and others). Note there is a camera control actor below the scene that has all the control code and I believe you need to click on it in the scene to see this.