Hello, I am expert with computer graphics, including opengl, threeJS, webGL, directx, and so on....also, digital image processing professor. Please, give me all details. What do you have until now?. Do you have the videos with the "mask" per frame?. Do you want to create the backend? (like inserting an user image into the frames of the video?). Do you have a base web page?. Best reards!