|If you examine that video window, there is an option to 'share' it via email - that may be your best option|
In this particular case, the video is 'Flash' animation, and not readily saved - you can often determine properties by right clicking and see what sort of context menu appears.
With some browsers, you may be able to search the browser cache for the file (probably .SWF) as most (but not all) video and other internet files do download onto your machine for playback
As well, there are applications that claim to be able to save flash video but I've never investigated
As far as embedding video files into email... I'm not so sure, and really, that'd be more of a web programming question, as I'd expect you'd need to create an HTML document - which many email clients do.
Sending a file as an attachment is simpler, but most video are a fair size, and may be too cumbersome to send at all (although Flash, is usually not as large)
Rather than sending massive files, just send the link
As to your 2nd question - - I'm not sure how you could edit an email and then forward it - it'd be simpler to send your own letter rather than forward, and just include the linked images you wish
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