ruby on rails 動画投稿機能　viewに表示されない

posts/show.html 
 <p>
    <%= link_to @post.video_url.to_s do %>
     <%= video_tag rails_blob_path(@post.video.to_s) %>
    <% end %>
  </p>

posts/new.html
 <%= form_for(@post, url: {controller: "posts", action: "create" }) do |f| %>
    <div class="form">
      <div class="from-body">
        <% @post.errors.full_messages.each do |message| %>
            <div class="form-error">
              <%= message %>
            </div>
        <% end %>
        <textarea name="content"><%= @post.content %></textarea>
       <%= f.file_field :video, {:accept => 'video/*',class: "field-video"} %>
      </div>
        <%= f.submit "送信" %>
      </div>
    </div>
    <% end %>

video_uploder
def extension_whitelist
   %w(jpg jpeg gif png MOV wmv mp4)
  end 

posts.controller
def create
    @post = Post.new(
      content: params[:content],
      user_id: @current_user.id,
      video: params[:video]

      )
    if @post.save
      flash[:notice] = "投稿を作成しました"
     redirect_to("/posts/index")
    else
     render("posts/new")

    end
  end