Create a link to put a welcome video in the comfirmation email

I would like to make a welcome video for my pts on what to expect and what they need to do before their first consult. This way i can also tell them to book the HT in, in advance, and we don't have to tell them at the front desk anymore. This must be in the confirmation and reminder email. But i think, if you can add links in all the sections, for us to refer to websites or video's, life would be a lot easier!