Enlarge video on coverpage Interactive book

Hi everyone, 

I am trying to figure out if there is a way to enlarge a video on the coverpage of the interactive book? I would ideally like it to be atleast half a page as shown in blue pen in the attached drawing. 

I have been using interactive book option a lot and just found out I can add a video instead of a photo to the coverpage. Unfortunately it is too small to really be of much benefit as I have created an intro video with audio and key points. 

I am using H5P in Moodle to create these interactive books for various modules in our short course.

Any suggestions appreciated!

Thank you in advance