Google DFP, video in the middle of the video

I need help integrating Google DFP.

I am using Google Media Framework Player and I am trying to make a campaign (Google DFP) that should show me a video in the middle of a video.

I need to do something like this . I have access to a DFP Premium account, but I don't know the correct steps to do a medium roll on a DFP account. I didn't find anything in my search documentation.

If anyone has any idea, it worked out well.

Thanks everyone.