Open the "Design" tab of your job and click on the "Edit" button for the body of the job:
Click the "Source Code" button on the toolbar
Paste the embed code of your video where you would like it to appear in the job ad and click save
Note: You can get the embed code from youtube by clicking the "Share" button in the bottom right of the video:
Then click the "Embed" option
Then copy the code presented eg:
To add a video to a Seek ad, do the following:
Go to a current Seek ad and click edit:
Scroll down to the Video Link field. The pasted link must resemble this format:
https://www.youtube.com/embed/dVDk7PXNXB8Click Save and Back when done, and your ad will be updated (if you have the necessary permission on Seek).