There are multiple ways to send a video file through email: attachment, cloud storage, file hosting, etc.
The easiest way is through email, but if the file is bigger than 25 MB, the email services will reject.
I would like to recommend uploading the video to the following services then you can simply paste the link with the video in the email you're about to send.
All these are free. Create an account, upload the file and then share it with your contacts through email.