QMediaPlayer player; // 感觉这里怪怪的, 不知道你是想怎么样
QVideoWidget videoWidget;
player = *new QMediaPlayer;
videoWidget =* new QVideoWidget; // 还没有见过这种写法
QMediaPlayer *pPlayer; //你想用指针就直接在.h定义指针
QVideoWidget *pVideoWidget;
pPlayer = new QMediaPlayer; // 然后在.cpp中new
pVideoWidget = new QVideoWidget;