You can capture an email address at the midpoint of a video. Video Email Capture, also known as “Gating,” is a creative solution to make your videos interactive and generate leads. Basically, it makes watching, or continuing to watch, your video dependent on the user entering their email address. This generates very high-quality leads, as you’re getting an email address from people who have already proven themselves willing to commit to engaging with your content. Brightcove has a great explanation of how it works, and Wistia makes a great tool to implement it.