diff --git a/wp-includes/theme.php b/wp-includes/theme.php
index da7fd65548..bc4e57f61c 100644
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -1338,15 +1338,24 @@ function get_header_video_url() {
 	$id = absint( get_theme_mod( 'header_video' ) );
 	$url = esc_url( get_theme_mod( 'external_header_video' ) );
 
-	if ( ! $id && ! $url ) {
-		return false;
-	}
-
 	if ( $id ) {
 		// Get the file URL from the attachment ID.
 		$url = wp_get_attachment_url( $id );
 	}
 
+	/**
+	 * Filters the header video URL.
+	 *
+	 * @since 4.8.0
+	 *
+	 * @param string $url Header video URL, if available.
+	 */
+	$url = apply_filters( 'get_header_video_url', $url );
+
+	if ( ! $id && ! $url ) {
+		return false;
+	}
+
 	return esc_url_raw( set_url_scheme( $url ) );
 }
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d9a67acb9d..56905e4d60 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-40044';
+$wp_version = '4.8-alpha-40045';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.