try this..
$args = array(
'post_type' => 'videolesson',
'ordeby' => 'rand',
'order' => 'DESC',
'posts_per_page' => 8,
'tax_query' => array(
'relation' => 'AND',
array(
'taxonomy' => 'level',
'field' => 'slug',
'terms' => 'beginner',
'compare' => 'IN',
),
array(
'taxonomy' => 'subjects',
'operator' => 'EXISTS'
)
),
);
$getting = new WP_Query( $args );