You can easily use KillerPlayer for YouTube shorts. First you have to convert the YouTube shorts video URL into a correct format.
Step 1: Enter the YouTube shorts URL
https://www.youtube.com/shorts/CzhbThZkAzc
Step 2: Set the Width as 420 and Height as 745 in the settings
Step 3: Click the EMBED button and enjoy the video
If you are still facing any issue, please contact us support@killerplayer.com