<asp:HyperLink ID="HyperLink1" Target="_blank" runat="server"
Text='<%# Eval("filenameName") %>' NavigateUrl='<%#String.Format("~/videos.aspx?videoPath={0}", Eval("VideoPath"))%>'>
</asp:HyperLink>
and in videos.aspx
protected void Page_Load(object sender, EventArgs e)
{
var path = Request.QueryString["videoPath"];
VideoPlayer1.Mp4Url = path;
}