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HTML

              
                .hero
  h1 Some other text
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Lemon)
  
*
  box-sizing border-box
  padding 0
  margin 0
  
html
body
  height 100%

.hero
  position relative
  background-image url(http://lorempizza.com/800/600)
  background-size cover
  width 100%
  height 100%
  opacity 0
  transition opacity .5s
  
  &.ready
    opacity 1
    
    h1
      display none

  h1
    position absolute
    top 50%
    left @top
    transform translate(-50%, -50%)
    color white
    font-family Lemon, sans-serif
  
  canvas
    position absolute
    top 0
    left 0
              
            
!

JS

              
                var hero = document.querySelector(".hero"),
    heading = hero.querySelector("h1"),
    canvas = document.createElement("canvas"),
    ctx = canvas.getContext("2d");

canvas.width = hero.clientWidth;
canvas.height = hero.clientHeight;

setTimeout(function () {
  ctx.fillStyle = "rgba(0, 0, 0, .8)";
  ctx.fillRect(0, 0, canvas.width, canvas.height);
  ctx.font = "80px Lemon";
  ctx.fillStyle = "rgba(0, 0, 0, 1)";
  ctx.globalCompositeOperation = "destination-out";
  ctx.fillText(heading.innerText, canvas.width / 4, canvas.height / 2);

  hero.appendChild(canvas);

  hero.className = "hero ready";
}, 1000);
              
            
!
999px

Console