\documentclass[11pt, aspectratio=169]{beamer}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage{tikz}
%\usetheme{Rochester}
\setbeamercolor{block title}{bg=blue,fg=white}
\setbeamercolor{block body}{bg=blue!15,fg=blue}
\setbeamercolor{block title alerted}{bg=red,fg=white}
\setbeamercolor{block body alerted}{bg=red!15,fg=red}
\definecolor{MyGreen}{RGB}{36,102,7}
\setbeamercolor{block title example}{bg=MyGreen,fg=white}
\setbeamercolor{block body example}{bg=green!15,fg=MyGreen}
\usepackage[pages=some,firstpage=true, opacity=1]{background}
\usepackage{lipsum}
\usepackage{svg}
\setsvg{inkscape=inkscape -z -D,svgpath=fig/}
\newcommand\BackImage[2][scale=1]{
\BgThispage
\backgroundsetup{
  contents={\includesvg[#1]{#2}}
  }
}
\definecolor{shadecolor}{RGB}{150,150,150}
\newcommand{\mybox}[1]{\par\noindent\colorbox{shadecolor}
{\parbox{\dimexpr 0.33\paperwidth\fboxsep\relax}{#1}}}
\setbeamertemplate{footline}[text line]{%
  \parbox{\linewidth}{\vspace*{-8pt}CS F441\hfill\insertshortauthor\hfill\insertpagenumber}}
\setbeamertemplate{navigation symbols}{}
\pgfdeclareimage[width=\paperwidth]{mybackground}{back_art_proj_3.png}
\setbeamertemplate{title page}{
        \begin{picture}(0,0)
            \put(-28.5,-155){%
                \pgfuseimage{mybackground}
            }
            
            % For a single line title the values below should be (0,-75)
            % For a two line title the values below should be (0,-65)
            % For a three line title the values below should be (2,-145)
            % You should toggle between \huge and \Large depending on your line length
            \put(0,-65){%
                \begin{minipage}[b][45mm][t]{226mm}
                    \huge \bf \rmfamily \inserttitle\par
                    %\usebeamerfont{author}{\insertauthor\par}
                \end{minipage}
            }
            
            % For a single line title the values below should be (2,-105)
            % For a two line title the values below should be (2,-125)
            % For a three line title the values below should be (2,-145)
            
            \put(2,-125){%
                \begin{minipage}[b][45mm][t]{226mm}
                    \usebeamerfont{author}{\color{blue} \insertauthor\par}
                \end{minipage}
            }
            
            % For a single line title the values below should be (2,-120)
            % For a two line title the values below should be (2,-140)
            % For a three line title the values below should be (2,-160)
            
            \put(2,-140){%
                \begin{minipage}[b][45mm][t]{226mm}
                    \scriptsize \color{blue} \insertinstitute \par
                \end{minipage}
            }
            \end{picture}
    }
%\titlegraphic{\begin{figure}
%\centering
%\BackImage[width=\paperwidth, height=\paperheight]{title_bg.svg}
%%\includesvg[width=\paperwidth, height=\paperheight]{title_bg.svg}
%\end{figure} 
%}
%
%\usepackage{eso-pic}
%\newcommand\BackgroundPic{%
%\put(0,0){%
%\parbox[b][\paperheight]{\paperwidth}{%
%\vfill
%\centering
%\includegraphics[width=\paperwidth,height=\paperheight,%
%keepaspectratio]{background.png}%
%\vfill
%}}}
\author[a.mukherjee]{Aritra Mukherjee}
\title{Presentation Template for BITS\\(Hyderabad Campus)} 
\logo{\vspace{9.5cm} \includegraphics[width=2.7cm]{bits_logo_strip.png}} 
\institute{Dept of CSIS, BITS Pilani, Hyderabad Campus} 
\begin{document}
\begin{frame}[plain]
\titlepage
\end{frame}
\begin{frame}
\tableofcontents
\end{frame}
\section{Section 1}
\begin{frame}{This is frame 1}
\lipsum[1]
\end{frame}
\section{Section 2}
\begin{frame}{This is frame 2}
\begin{block}{This is a block}
Here goes some text
\end{block}
\begin{alertblock}{This is a alert block}
Here goes some text
\end{alertblock}
\begin{examples}{This is a examples}
Here goes some text
\end{examples}
\end{frame}
\end{document}