Mailto links can be used to send an email to a provided email address. The user that clicks this button in the video will be prompted to open an email client. A new mail will be automatically filled in with your provided data.
Keep in mind that this only works when the viewers of your video installed an email client like Outlook on Windows or Gmail on Android. Use the following text and change email@xample.com to your own email adress.
mailto://email@xample.com
You can also provide a subject by appending the text below. Replace Exampletext for your own subject.
?subject=Exampletext