Adding a video box

I have tried embedding the link to a video so that it plays on the website but this specific link will not work, http://essentialsinwriting.wistia.com/medias/5n0t4co90q?embedType=iframe&videoWidth=640

We already have another video using the same program, wista, and it works and is a video box but this link will not work and I have no clue what to do.