Can't find mediaDevices within Service Worker.

navigator doesn't contain 'mediaDevices'

Here is part of Manifest :

  "permissions": [
    "desktopCapture",
    "tabs",
    "storage",
    "unlimitedStorage",
    "notifications",
    "background",
    "cookies",
    "activeTab",
    "scripting"
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "web_accessible_resources": [{
    "resources": ["app.html"],
    "matches": ["<all_urls>"]
  }]

Ther is any ways how to 'add' mediaDevices into navigator?