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You can embed videos and make it as your radio button options, but I'm afraid the result would not come as the video. So, for this to work and so you know the selected video, I would advise to add the video title. Look at this example form: http://www.jotformpro.com/form/40795688797986
You can also use this widget as an alternative, you can put thumbnail images: http://widgets.jotform.com/widget/image_radio_buttons