Drupal Form API

Drupal Image (Media) Field

  $form['image'] = array(
    '#type' => 'media',
    '#tree' => TRUE,
    '#title' => t('Image'),
    '#description' => t('Allowed formats: png, jpg, jpeg, gif.'),
    '#media_options' => array(
      'global' => array(
        'file_extensions' => 'png jpg jpeg gif',
        'max_filesize' => '20 MB',
        'file_directory' => '',
        'types' => array('image'),
      ),
    ),
    '#default_value' => $conf['image'],
    '#required' => FALSE,
  );
  ctools_form_include($form_state, 'content');
  ctools_form_include($form_state, 'gc_locations', 'gc_panes', 'plugins/content_types/gc_locations');

https://www.drupal.org/node/2288487