Download Video Module from project page
Required Modules for Video Module
Here's the list of modules that we must need for Video Module. Every module listed below contains the module's project page on drupal.org. We are recommend you to extract the directory contained in the compressed file and upload it to sites/all/modules directory.
Needed to upload Videos,
Only needed if you need to play videos with additional player options
After you've uploaded these modules, you can install them on the module administration page (at Administer > Site building > Modules). Now you can see uploaded Modules with Video Module.
You can enable them by clicking the checkbox next to each module and clicking the Save Configuration. Once you've finished this step, you're ready to move on to the last step, installing Video Module.
Installing Video Module
Download the latest stable version of the Video Module, extract the files, read the directions, upload the resulting folder, and enable the module in Administer > Site building > Modules.
Link : Detailed description on installing contributed modules.