To send a video / screencast you can use a screen recorder app.
If your device is Lollipop you can use this app to record your screen:
https://play.google.com/store/apps/details?id=com.rivulus.screenrecording
Alternatively, you can take a screencast using the AZ Screen Recorder app:
https://play.google.com/store/apps/details?id=com.hecorat.screenrecorder.free
