A metallic door opens to reveal whatever you’d like to put behind it. You can use this to introduce something by either chroma keying the green out, or by using the included alpha channel as a mask.
Metal door opens to reveal green screen
Alpha Channel: Yes, Looped Video: No, Resolution: 1920x1080, Video Encoding: Quicktime Photo-JPEG, File Size: 17.1mb, Total Clip(s) Length: 5:00