Participant's webcam control

Hi,
We are using Zoom Meeting for one of our trainings. We require that participants turn on their webcam during the training. However, some participants turn off the webcam in the middle of the training. In that case, the host notes the time when the participant's webcam is off. This process is burdensome for the host.

1. Is it possible to force participants to turn their webcams on?

2. Is there a way to know when a participant's webcam is on (meeting log?) ?
Thanks,