Consegui corrigir o erro, alterei o local da pasta public para:
C:\Users\Thiago Saad\Desktop\projeto\pokemonleague\public
A imagem e o vídeo de background apareceram, porém assim que o server inicia ele cai com esta mensagem de erro: Como resolver?
=> Started proxy.
=> Started MongoDB.
=> Started your app.
=> App running at: http://localhost:3000/
Type Control-C twice to stop.
=> Client modified -- refreshingbuffer.js:25
const ui8 = new Uint8Array(size);
^
RangeError: Invalid array buffer length
at new ArrayBuffer (native)
at new Uint8Array (native)
at createBuffer (buffer.js:25:17)
at new SlowBuffer (buffer.js:74:10)
at FSReqWrap.readFileAfterStat [as oncomplete] (fs.js:335:20)