If Windows 7 Media Player does not load the video when sharing videos on the screen, the resolution may be high and the video may be restricted.
Maximum resolution supported by Windows Media Player 7
Due to software and DXVA decoding limitations, it is 1920 x 1080 pixels .
Please check the announcement from Microsoft for details. H.264 Video Decoder .
If the shared screen resolution is higher than 1920 x 1080
It is not possible to play the recorded Zoom video of shared screen on Windows 7 with WMP.
Recording resolution is based on the largest shared screen in a meeting or webinar.