documentclass{article}
usepackage{amsmath}
usepackage{multirow}
usepackage{easybmat}

newcommandbigzero{makebox(0,0){text{Huge0}}}
begin{document}

[
sbox0{$begin{array}{c c c |}0&1&0\0&0&1\0&0&0\ hlineend{array}$}
sbox1{$begin{array}{| r|}hline \ 2\ hlineend{array}$}
sbox2{$begin{matrix}2&1&0\0&2&1\0&0&2end{matrix}$}
sbox3{$begin{array}{c c c |}2&1&0\0&2&1\0&0&2\ hlineend{array}$}
%
A=left[
begin{array}{c c c c}
usebox{0}&  & bigzero & \
& usebox{1} &  & \
bigzero & & usebox{3} & \
& &  & 0 \
end{array}
right]
]

end{document}

documentclass{article}
usepackage{tikz}
usetikzlibrary{matrix}
begin{document}

[ A =
  begin{tikzpicture}[baseline=(current bounding box.center),
                      large/.style={font=large}]
    matrix (M)[matrix of math nodes, nodes in empty cells,
                left delimiter={[}, right delimiter={]},
                column sep={1.2em,between origins},
                row sep={1.2em,between origins}
    ]{ 0 & 1 & 0 &   &              \
       0 & 0 & 1 &   &   &   &   &  \
       0 & 0 & 0 &   &   &          \
         &   &   & 2 &   &          \
         &   &   &   & 2 & 1 & 0 &  \
         &   &   &   & 0 & 2 & 1 &  \
         &   &   &   & 0 & 0 & 2 &  \
         &   &   &   &   &   &   & 0\
     };
    draw(M-3-1.south west)--([xshift=2mm]M-3-4.south east);
    draw(M-4-3.south)--(M-4-4.south east);
    draw(M-7-5.south)--([xshift=2mm]M-7-7.south);
    draw(M-1-3.north east)--(M-4-4.south west);
    draw(M-4-4.north east)--(M-5-5.south west);
    draw(M-5-7.north east)--(M-7-7.south east);
    node[large] at (M-2-7){$0$};
    node[large] at (M-7-2){$0$};
  end{tikzpicture}
]

end{document}

documentclass{article}
usepackage{tikz}
usetikzlibrary{matrix}
begin{document}

[ A =
  begin{tikzpicture}[baseline=(current bounding box.center),
                  large/.style={font=large}]
    matrix (M)[matrix of math nodes, nodes in empty cells,
            left delimiter={[}, right delimiter={]},
            column sep={1.2em,between origins},
            row sep={1.2em,between origins}
    ]{ 0 & 1 & 0 &   &              \
       0 & 0 & 1 &   &   &   &   &  \
       0 & 0 & 0 &   &   &          \
         &   &   & 2 &   &          \
         &   &   &   & 2 & 1 & 0 &  \
         &   &   &   & 0 & 2 & 1 &  \
         &   &   &   & 0 & 0 & 2 &  \
         &   &   &   &   &   &   & 0\
     };
    draw(M-3-1.south west)--([xshift=2mm]M-3-4.south east);
    draw([xshift=1mm]M-4-3.south)--([xshift=1mm]M-4-4.south east);
    draw(M-7-5.south)--([xshift=3mm]M-7-7.south);
    draw(M-1-3.north east)--(M-4-4.south west);
    draw(M-4-4.north east)--(M-5-5.south west);
    draw(M-5-7.north east)--([yshift=-1mm]M-7-7.south east);
    node[] at (M-2-7){Huge 0};
    node[] at (M-7-2){Huge 0};
  end{tikzpicture}
]

end{document}