importing existing site with videos

I am attempting to import an existing blog from blogger blogspot to a www.ads-software.com site running the virtue theme. I have been using wordpress importer pluggin. Everything seems to come in ok except for my videos which are on youtube. I just get the youtube link in brackets like this
[youtube https://www.youtube.com/watch?v=XqRL8pRtV_s&w=640&h=360%5D
rather then the video.

I have already tried changing the /wp-includes – kses.php code to:
// Post filtering
#add_filter(‘content_save_pre’, ‘wp_filter_post_kses’);
#add_filter(‘excerpt_save_pre’, ‘wp_filter_post_kses’);
#add_filter(‘content_filtered_save_pre’, ‘wp_filter_post_kses’);

I have also already tried changing the php code in the plugin to comment out //$post_exists = post_exists( $post[‘post_title’], ..
as described on this page https://9seeds.com/tech/converting-blogspot-blogger-to-hosted-wordpress/

STILL doesn’t work – can you please help me.