You can play video, even stream video as a texture to 3D objects in WebGL using javascript.
YOUTUBE 50bUo6PMEVI Fun with WebGL 2.0 : 016 : Video Texture - github
WebGL WEBGL_video_texture Extension Proposed Specification
Textures — Blend4Web 17.10 User Manual
VideoTexture - three.js docs
Safari/iOS problems when drawing videos on WebGL canvas
