How the video is stored in database table does database have that much size?

Answer 1

The database can store video files directly as BLOB (Binary large objects), but it is better to store the links to the videos, like paths.

Answer 2

Files are stored in database as varbinary or BLOB objects. If bigger files are uploaded to database, size will increase and it will effect the performance of the dB. Instead of that you can keep the files in a file system or in cloud and keep the path reference in dB.