Working with Video
There are a number of issues to consider: file upload & storage, streaming limits and website security.
When you have read this article you may prefer to simply upload your videos to a streaming service provider like YouTube.
And then include a link from your website to these videos as and when appropriate.
If you want to embed video in your website then we can provide support.
File Upload & Storage
Most providers of shared server hosting impose Server Upload Limits which prevent uploading of very large files (example: greater than 4 MB).
Video files are usually quite large and so this may be the first obstacle you face.
You could use File Transfer Protocol (FTP) to upload very large files but this is not without risk - see below.
The second obstacle will be that your Joomla! CMS by default prevents upload of certain file types, including video files.
Both of these obstacles can be overcome but even then you may be prevented from streaming the video files you upload.