Accumulate the budget of the movie titles with the keyword of "video game".
keyword of "video game" refers to keyword_name = 'video game'
SELECT SUM(T1.budget) FROM movie AS T1 INNER JOIN movie_keywords AS T2 ON T1.movie_id = T2.movie_id INNER JOIN keyword AS T3 ON T2.keyword_id = T3.keyword_id WHERE T3.keyword_name = 'video game'