Slider section and video section

Please my slider keeps giving space below images at first I thought one or two images were more in height so I resized all my images to same with and height it still remained the same , I checked the required size for slider image and made my image so still it did not, how do I make all my images to automatically fit.

Secondly video section shows ash background expect when play is clicked then you can see the video.

Lastly if I change to a different demo still on enlighten pro theme will I loose the content of my present demo and why is my home page not customizable even when I am using pro version

The page I need help with: [log in to see the link]