From the To field, enter a 10-digit mobile number
Alternatively, enter a contact name. As the name is entered, a matching contact may appear and can be selected at any time.
Repeat this step as necessary to add additional recipients.
From the Text Message field, enter a message.
Tap the Camera icon (on the left).
Tap Photo Library.
Tap the album (e.g., Camera Roll, Videos, etc.).
Tap the video.
Tap Choose (lower-right).
Tap the Send icon (in the text field).
The Send icon appears green in text messages and blue in iMessages.