adding video to portfolio responsive page

I’m new to wordpress, I have installed this theme http://demo.krownthemes.com/huge/
please can any one suggest me how to add video by replacing 4 boxes with a single video from the Product (portfolio) page

the link where i installed theme is
http://amrockytechnologies.com/clientswebsite/s4solutions/

https://wordpress.org/plugins/post/