Unfortunately that wouldn't be possible without custom programming for this position. The custom_1 position was specifically designed to be full width and output a video to the container. You would need to use one of the other Vertex based positions below:http://www.shape5.com/demo/incline/index.php/features-mainmenu-47/template-features/module-positions
Height for the other positions will just be based on the content published too them as it is responsive. You wouldn't want to specify a certain height to a position as responsive wouldn't work properly.