How hide video block ?

Actually there is an option for the purpose

var editor = grapesjs.init({
     ...
      container : '#gjs',
      plugins: ['gjs-blocks-basic'],
      pluginsOpts: {
        'gjs-blocks-basic': {
          // Which blocks to add, just omit 'video'
          blocks: ['column1', 'column2', 'column3', 'column3-7', 'text', 'link', 'image', 'map']
        }
      }
  });

1. Open src/blocks.js. Remove line 95 -> 109 (line 95 start with if (blocks.indexOf('video') >= 0) {)
2. Open src/index.js, line 7: remove 'video',

Rebuild package. I guess it will work!

Thanks you @artf