I have added an .htaccess file in document root for the specific website on the server in /var/www/website/.htaccess
AddType video/mp4 .mp4
But there is no AllowOverRide directive in the 000-default.conf file to make the change.
I added the following to my apache2.conf file
<Directory /var/www/mywebsite/> Allowoverride All </Directory>
And restarted apache2 but still does not work.