This plugin aims at providing users the capability to upload video to a post. It uses wp.media js object to open an uploader frame and choose/upload videos. Once the video is selected, it will save the id of uploaded media object in a custom field.
You can use the function aoc_get_post_video($post_id) to retrieve the url of video that has been uploaded to a post. This function accepts the id of post (for which the video is to be fetched) as a parameter.