acf-banner-import.json

[
  {
    "key":"group_53db8f58e0148",
    "title":"Custom Banner Title",
    "fields":[
      {
        "key":"field_53dbd7b738f50",
        "label":"Banner Title",
        "name":"banner_title",
        "prefix":"",
        "type":"text",
        "instructions":"Put your title here.",
        "required":1,
        "conditional_logic":0,
        "wrapper":{
          "width":"",
          "class":"",
          "id":""
        },
        "default_value":"",
        "placeholder":"Please Enter Your Unique Title Here...",
        "prepend":"",
        "append":"",
        "maxlength":55,
        "readonly":0,
        "disabled":0
      },
      {
        "key":"field_53db901dfae31",
        "label":"Banner Subtitle",
        "name":"banner_subtitle",
        "prefix":"",
        "type":"textarea",
        "instructions":"Put your banner subtitle here",
        "required":0,
        "conditional_logic":0,
        "wrapper":{
          "width":"",
          "class":"",
          "id":""
        },
        "default_value":"",
        "placeholder":"Subtitle text here...",
        "maxlength":125,
        "rows":3,
        "new_lines":"br",
        "readonly":0,
        "disabled":0
      },
      {
        "key":"field_53db9960bf1b1",
        "label":"Select a Background Image",
        "name":"banner_background_image",
        "prefix":"",
        "type":"image",
        "instructions":"Choose a custom image for this services header background.",
        "required":1,
        "conditional_logic":0,
        "wrapper":{
          "width":"",
          "class":"",
          "id":""
        },
        "return_format":"url",
        "preview_size":"full",
        "library":"all"
      }
    ],
    "location":[
      [
        {
          "param":"page_template",
          "operator":"==",
          "value":"page_banner-header.php"
        }
      ]
    ],
    "menu_order":1,
    "position":"acf_after_title",
    "style":"default",
    "label_placement":"left",
    "instruction_placement":"field",
    "hide_on_screen":""
  }
]

page_banner-header.php

<?php
/**
 * Template Name: Banner Header
 */

// UPLOAD THIS ENTIRE FILE TO YOUR ACTIVE THEMES MAIN FOLDER (wordpress/wp-content/themes/mytheme/page_banner-header.php)


get_header(); 

/* ACF fields */
$banner_title = get_field('banner_title');
$banner_subtitle = get_field('$banner_subtitle');
$banner_background_image = get_field('banner_background_image');
?>
<div class="banner-area" style="background-size: cover; background-image: url('<?php echo $banner_background_image; ?>');">
    <div class="banner-inner-wrap">
        <h1><?php echo $banner_title; ?></h1>
        <p><?php echo $banner_subtitle; ?></p>
    </div>
</div><!-- // end custom banner -->

<div id="primary">
	<div id="content" role="main">
		<?php while ( have_posts() ) : the_post(); ?>
			<p><?php the_content(); ?></p>
		<?php endwhile; // end of the loop. ?>
	</div><!-- #content -->
</div><!-- #primary -->

<?php get_footer(); ?>

First, install Advanced Custom Fields: https://wordpress.org/plugins/advanced-custom-fields/. Second, navigate to http://your-site.com/wp-admin/edit.php?post_type=acf-field-group&page=acf-settings-export and upload acf-banner-import.json. Third, add page_banner-header.php below to your active theme folder. Last, add a new page at (http://mbiold.wpengine.com/wp-admin/post-new.php?post_type=page) and chose your new template called "Banner Header". Now edit your fields, add your background, and thats it.