This question is rather similar to Beamer: Reserving space for video overlay :
For preparing a video lecture, I would like to have a frame template on which I can reserve a rectangular area, on which I want to place later a camera overlay for screencasting.
But with the additional requirement: I don't want to take care of not using the reserved space manually.
I tried to use \logo, but that does not behave as I had hoped.
(See "cursus", footnote text, and caption in MWE.)
MWE:
\documentclass[english,beameralt,aspectratio=169]{beamer}
\usepackage{lipsum}
\usepackage{booktabs}
\usepackage[backend=bibtex]{biblatex}
\addbibresource{lipsum.bib}
\begin{filecontents}[overwrite]{lipsum.bib}
@misc{lipsum, author={\lipsum[8][1]}, title = {\lipsum[8][2]}}
\end{filecontents}
\renewcommand{\footfullcite}[1]{\cite{#1}\footnote[frame]{\fullcite{#1}}}
\logo{\textcolor{gray}{\rule{2cm}{2cm}}}
\begin{document}
\begin{frame}{\lipsum[1][1]}
\begin{columns}
\begin{column}{.5\textwidth}
\lipsum[4]~\footfullcite{lipsum}
\end{column}
\begin{column}{.5\textwidth}
\lipsum[2]
\end{column}
\end{columns}
\end{frame}
\begin{frame}{\lipsum[5][1]}
\begin{columns}
\begin{column}{.5\textwidth}
\lipsum[6]
\end{column}
\begin{column}{.5\textwidth}
\lipsum[7][1-8]
\vspace*{\fill}
\begin{table}
\begin{tabular}{lrrrr}
\toprule
Lorem & Ipsum & Dolor & Sit & Amet\\
\midrule
Lorem & Ipsum & Dolor & Sit & Amet\\
Lorem & Ipsum & Dolor & Sit & Amet\\
\bottomrule
\end{tabular}
\caption{\lipsum[3][1]}
\end{table}
\end{column}
\end{columns}
\end{frame}
\end{document}
Result:
