Use CMB2 to set product hero image in Essence Pro: Set header image on product & category pages to one set in CMB2 meta box or main product image - in Essence Pro theme. https://www.damiencarbery.com/2018/09/use-cmb2-to-set-product-hero-image-in-essence-pro/

essence-pro-product-header-image-with-cmb2.php

<?php
/*
Plugin Name: Product Header Image for Essence Pro
Plugin URI: https://damiencarbery.com/2018/09/use-cmb2-to-set-product-hero-image-in-essence-pro/
Description: Set the header image to a product image in Essence Pro.
Author: Damien Carbery
Version: 0.6
*/


// When on a product page retrieve image set via CMB2 meta box or first product image.
// Use this short-circuit filter to make it quicker on product pages - if the 'genesis_get_image'
// filter was used then the 'genesis_get_image()' function would have unnecessarily called a
// number of attachment related functions (which involve database queries).
add_filter( 'genesis_pre_get_image', 'dcwd_short_circuit_product_header_image', 10, 3 );
function dcwd_short_circuit_product_header_image( $false, $args, $post_obj ) {
	// Only run when a header hero image is being sought.
	if ( 'header-hero' == $args[ 'size' ] ) {
		$image_url = $false;
		// Check whether an image is set via the CMB2 meta box 
		if ( is_product() ) {
			$image_url = get_post_meta( get_the_ID(), 'header_hero', true );

			// Otherwise use the main product image.
			if ( empty( $image_url ) ) {
				$featured_image_id = get_post_thumbnail_id( get_the_ID() );
				// If a product image is not set then return and allow calling function use default image.
				// Add 0 to force $featured_image_id into a number if it can be converted (this should not
				// be needed but even when it was a numeric string like "37" it still failed is_numeric()!
				if ( !is_numeric( $featured_image_id + 0 ) ) {
					return $false;
				}
				list( $image_url ) = wp_get_attachment_image_src( $featured_image_id, 'header-hero' );
				// Another check to ensure the image is available.
				if ( empty( $image_url ) ) {
					return $false;
				}
			}
		}
		// For the product category we check term meta for the image.
		if ( is_product_category() ) {
			$image_url = get_term_meta( get_queried_object_id(), 'header_hero', true );
			// If none set then use the default.
			if ( empty( $image_url ) ) {
				return $false;
			}
		}
		return $image_url;
	}
	return $false;
}


add_action( 'cmb2_admin_init', 'cmb2_product_metaboxes' );
function cmb2_product_metaboxes() {
	/// Initiate the metabox
	$cmb_product = new_cmb2_box( array(
		'id'            => 'ep_products',
		'title'         => 'Header hero image',
		'object_types'  => array( 'product', ), // Post type
		'context'       => 'side',  // Place in sidebar
		'priority'      => 'low',   // near the 'Product image' and 'Product gallery' meta boxes.
		'show_names'    => true, // Show field names on the left
	) );
	
	$cmb_product->add_field( array(
		'desc'    => 'Upload an image or enter an URL. Suggested size: 1800 x 700.',
		'id'      => 'header_hero',
		'type'    => 'file',
		'options' => array(
			'url' => false, // Hide the text input for the url
		),
		'text'    => array(
			'add_upload_file_text' => 'Set Hero Image' // Change upload button text. Default: "Add or Upload File"
		),
		'query_args' => array(
			 'type' => array( 'image/gif', 'image/jpeg', 'image/png', ),  // Limit to image types.
		),
		'preview_size' => 'small',
	) );

	// Add same meta box for product categories.
	$cmb_product_category = new_cmb2_box( array(
		'id'            => 'ep_product_cat',
		'title'         => 'Header hero image',
		'object_types'  => array( 'term', ), // Store in term meta
		'taxonomies'    => array( 'product_cat', ),
		'show_names'    => true, // Show field names on the left
	) );

	$cmb_product_category->add_field( array(
		'name'    => 'Hero Image',
		'desc'    => 'Upload an image or enter an URL. Suggested size: 1800 x 700.',
		'id'      => 'header_hero',
		'type'    => 'file',
		'options' => array(
			'url' => false, // Hide the text input for the url
		),
		'text'    => array(
			'add_upload_file_text' => 'Set Hero Image' // Change upload button text. Default: "Add or Upload File"
		),
		'query_args' => array(
			 'type' => array( 'image/gif', 'image/jpeg', 'image/png', ),  // Limit to image types.
		),
		'preview_size' => 'small',
	) );
}


// Verify that CMB2 plugin is active.
add_action( 'admin_notices', 'verify_cmb2_active' );
function verify_cmb2_active() {
	if ( ! defined( 'CMB2_LOADED' ) ) {
		$plugin_data = get_plugin_data( __FILE__ );
		$plugin_name = $plugin_data['Name'];
?>
<div class="notice notice-warning is-dismissible"><p>Plugin <strong><?php echo $plugin_name; ?></strong> requires <a href="https://wordpress.org/plugins/cmb2/">CMB2 plugin</a>.</p></div>
<?php
		//error_log( 'CMB2 is not active.' );
	}
}