It would probably be better practice to store the file name in the database and the video on the server itself, since video files can be quite heavy. However, that being said, I think a solution like this should work:
1. Inserting the video in the database
You need to have a table to insert the video into; Something like this
CREATE TABLE VIDEOTABLE (
ID INTEGER NOT NULL PRIMARY KEY,
VIDEONAME VARCHAR (64),
VIDEO LONGBLOB );
would give you a table like this:
-----------------------------------
Row | ID | VIDEONAME | VIDEO |
-----------------------------------
1 | 33 | My Movie | 10100101...* |
-----------------------------------
(*I don't actually know how the video-data would be represented in the VIDEO row.)
Once you've created that table, you'd need to insert the movie into it - let's say you have your video saved on your PC at C:\users\example\video\MyMovie.mp4
INSERT INTO VIDEOTABLE VALUES (33, "My Movie", LOAD_FILE("C:\\users\\example\\video\\MyMovie.mp4"));
2. Retrieving the file from the database
When it comes to retrieving the video again, have a look at this excellent guide from about.com about retrieving the files from a databse with PHP. The entire tutorial is very helpful guide when it comes to writing files to a database, so you'll definitely want to take a look at the whole thing. Here's the code-snippet - you should be able to modify it to suit your needs if you read the guide.
<?php
mysql_connect("your.server.com","username","password");
mysql_select_db("database_name");
$query = "SELECT data,filetype FROM uploads where id=$id";
$result = MYSQL_QUERY($query);
$data = MYSQL_RESULT($result,0,"data");
$type = MYSQL_RESULT($result,0,"filetype");
Header( "Content-type: $type");
print $data;
?>