Thanks for letting us know about the situation and we'd love to help you with this.
TemplateToaster allows you to add video and set its working function. You can click on the Repeat button to display your video in the loop. Follow the steps to set the video in repeat mode
Open TemplateToaster->Your Template->Header->Video->Repeat
We are also sharing the screenshot for your reference. We hope this is helpful. Let us know if you have any more questions, comments, orconcerns