Make it the same way as you send, but don't embed the video into the PDF, but make a link or button with a link to open the video when someone is online, so he can watch that film.
Other possibility is, to export as EPUB3 with fixed layout. You need an actual EPUB reader, like iBooks and you can do the same.
All that can easiest be done with HTML only. What should be your main objective: "Needs to be able to open for the majority of users" is then almost 100%. Everything else (PDF, video-in-PDF, video-in-URL) needs a really good mail reader.
Why are you asking this in the InDesign forum? And can you explain how your tags are relevant to your post?
Designing emails that hold format across all email clients (there are currently around 24) is challenging because they all have different way of handling HTML tags and many do not support CSS styles. Unless you are very fluent with HTML and know the limitations of various email clients an email service like Constant Contact is the way to go.
Rob Day is spot on - InDesign is not the right tool for this at all.
I don't used Constant Contact, but I do use Customer Minds, which I highly recommend.
thanks for the reply, the issue isn't how I facilitate sending out the email - it's how I export the design.
There is no stable way to export the design for an email campaign.
Email campaigns are built around use of tables, as email readers are very primitive, relatively. Outlook is just a dressed up Word document. And most email readers are basic html interpreters.
You could send it as a PDF or a Fixed Layout EPUB - but that would require a 3rd party app (Adobe reader or epub reader) to open the email shot.
Ideally, you'd want the content to be in front of them when they open the email and not have to download or open another file format.
That's why these things like Constant Contact, Customer Minds, Campaign Monitor, Mail Chimp, etc. exist - as they have built platforms that allow email content to be sent to a variety of email clients (that is programs that open emails like, yahoo, google, outlook, thunderbird, and all the other email applications on the market).
There is no direct export from InDesign - the best thing to do is rebuild your design in the software that's designed for sending out email shots.