You can insert a video into your survey through the Edit Survey section. Click on the text of the question that you would like to insert the video in. After clicking on the question's text, you have the option of clicking on Rich Text Editor, which will be directly above the question's text.
When the Rich Text Editor is brought up, you can click on the filmstrip icon (it is on the top row, the third icon from the left). This is the "insert a video" option. you will then need to type in your video URL. You can also specify the media type and the video's width and height. You can also preview your video at this time.
The video will appear in your survey, looking something like this:
This is an effective research tool that is often used to hold attention of respondents, gather feedback in subsequent questions, or gather opinions about the content.