Chat messenger which uses image and video steganography

this is a chat system which has the option of using image and video steganography. here the sender can send images and videos via chat/ inside the images the sender must be able to hide files such as .txt, pdfs, other image format files. likewise the chat system should have the video steganography option. here the sender should be able to send videos which has secret files inside it. main challenge is a video file should be able to hide another video inside it. other than the video , any image format file, pdfs, text documents and any other possible file. only the receiver should be able to extract the files inside.