Xbox Video for Windows Phone grabbed a minor update today. The update isn't huge, but brings some quality-of-life improvements. Videos from the camera roll will now appear in the Video app, and the update also fixes an issue that would cause the multi-select button to disappear when offline.
The changes aren't reflected on the store page, as it just details "minor bug fixes," but they can be found on Xbox Video's announcements page here
Feel free to head on over to the store to update your video app now, and let us know what you think in the comments.
Source: Xbox Video
Thanks for the tips everyone!