How to insert the header image that appears in the vendor page even in single product page

You can insert header image in the vendor page if you add this code in your functions.php:

if( function_exists( 'YITH_Vendors' ) ){
 add_action( 'init', 'yith_wcmv_add_store_header_in_single_product_page', 20 );

function yith_wcmv_add_store_header_in_single_product_page(){
 add_action( 'woocommerce_before_single_product_summary', 'yith_wcmv_add_store_header_page', 5 );
 }

function yith_wcmv_add_store_header_page(){
 global $product;
 $vendor = yith_get_vendor( $product, 'product' );

if ( $vendor->is_valid() ) {
 global $sitepress;
 $has_wpml = ! empty( $sitepress );
 $term = $default_term = null;
 $term_slug = get_query_var( 'term' );
 if( $has_wpml ){
 $term = get_term_by( 'slug', $term_slug, YITH_Vendors()->get_taxonomy_name() );
 $term_slug = yit_wpml_object_id( $term->term_id, YITH_Vendors()->get_taxonomy_name(), true, wpml_get_default_language() );
 $default_term = get_term( $term_slug, YITH_Vendors()->get_taxonomy_name() );
 }

if ( 'no' == $vendor->enable_selling ) {
 return false;
 }

$header_img_class = apply_filters( 'yith_wcmv_header_img_class', array( 'class' => 'store-image' ) );

$args = array(
 'vendor' => $vendor,
 'name' => $has_wpml ? $default_term->name : $vendor->name,
 'header_skin' => get_option( 'yith_vendors_skin_header', 'small-box' ),
 'show_total_sales' => 'yes' == get_option( 'yith_wpv_vendor_total_sales' ) ? true : false,
 'icons' => apply_filters( 'yith_wcmv_header_icons_class', array(
 'rating' => 'fa fa-star-half-o',
 'sales' => 'fa fa-credit-card',
 'vat' => 'fa fa-file-text-o',
 'legal_notes' => 'fa fa-gavel',
 )
 ),
 'owner' => get_user_by( 'id', $vendor->owner ),
 'header_image_html' => get_option( 'yith_vendors_skin_hmtl_header_image_format', 'image' ),
 'header_img_class' => $header_img_class,
 'header_image' => wp_get_attachment_image( $vendor->header_image, 'big', false, $header_img_class ),
 'owner_avatar' => get_avatar( $vendor->owner, get_option( 'yith_vendors_gravatar_image_size', '62' ) ),
 'vendor_reviews' => $vendor->get_reviews_average_and_product(),
 'total_sales' => count( $vendor->get_orders( 'suborder' ) ),
 'store_header_class' => apply_filters( 'yith_wcmv_store_header_class', 'store-header-wrapper' ),
 'show_vendor_vat' => 'yes' === get_option( 'yith_wpv_vendor_show_vendor_vat', 'yes' ) ? true : false,
 'show_gravatar' => 'enabled' == get_option( 'yith_vendors_show_gravatar_image', 'enabled' ) && 'yes' == $vendor->show_gravatar,
 'socials_list' => YITH_Vendors()->get_social_fields(),
 );

do_action( 'yith_wcmv_before_vendor_header', $args, $vendor );
 yith_wcpv_get_template( 'store-header', $args, 'woocommerce/loop' );

/* Vacation Module */
 if( $vendor->is_on_vacation() ){
 yith_wcpv_get_template( 'store-vacation', array( 'vacation_message' => $vendor->vacation_message ), 'woocommerce/loop' );
 }

/* Vendor Description */
 $vendor_description = $has_wpml ? $default_term->description : $vendor->description;
 if( 'yes' == get_option( 'yith_wpv_vendor_store_description', 'no' ) && ! empty( $vendor_description ) ){
 $args = array(
 'store_description_class' => apply_filters( 'yith_wcmv_store_descritpion_class', 'store-description-wrapper' ),
 'vendor_description' => $vendor_description
 );
 yith_wcpv_get_template( 'store-description', $args, 'woocommerce/loop' );
 }
 do_action( 'yith_wcmv_after_vendor_header', $args, $vendor );
 }
 }
}