You CANNOT directly upload from a mobile device to Canvas.  You will need to transfer the video to a computer and then upload.   One way is to move the video to Google Drive and then download the video to the computer.  Then upload via Kaltura to Canvas.

Upload video from iPhone or iPad  to Google Drive

Upload video from Android to Google Drive

After the video is on a computer, use this help to upload to Canvas via Kaltura.

Upload via Kaltura to Canvas