How to integrate option tree in wordpress theme?

functions.php

/* Theme Options */
require_once( get_template_directory() . '/inc/theme-options/option-tree/ot-loader.php' );

// Integrate OptionTree
add_filter( 'ot_theme_mode', '__return_true' );

// Hide Documentation Page
add_filter( 'ot_show_pages', '__return_false' );
add_filter( 'ot_show_new_layout', '__return_false' );