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Add gem in Gemgile

  gem "paperclip"
  gem "jw_player_helper"

Add following validation on Model . here i recomended Product.rb

  has_attached_file :video,   :styles => { :small    => '94x58#',:medium   => '188x116#',  :large    => '376x232#' },
          
        :url  => "/assets/posts/:id/:style/:basename.:extension",
        :path => ":rails_root/public/assets/posts/:id/:style/:basename.:extension"
  validates_attachment_presence :video
  validates_attachment_size :video, :less_than => 100.megabytes
  validates_attachment_content_type :video, :content_type => ['video/mp4', 'video/flv','video/3gp']
  
Add Javascript in Application.html.erb

  <%= javascript_include_tag 'swfobject' %>
  
On show.html.erb  I play video, So that add a line here with video_play tag

  <%= video_player({:file => @product.video.url,  :mute => true}, {:width => 440, :height => 300}) %>