In the front page there is a Video background just like you asked .beacuse of the recording the video is slow,but in really it is fast and not laggy. I think i can improve this also i wanted to add th e youtube video but i didnt. anyway hope you like it. it is responsive. Please see the both screenshot and video. waiting for your feedback. and yes the GIF is laggy.If you want a live demo please feel free to ask me.