You can trim the video down to a smaller clip and attach it to an email. If it's still too large, the best way is to upload it to Dropbox, Google Drive, or WeTransfer and share the file. If that sounds too complicated, you can also record the sections you want on your phone while the video is playing on your computer or TV (it's best to use the voice memos or voice recorder app on your phone) and email that file to me right from your phone.