How to charge canon eos 7D mkii using laptop and usb cable port.. ,how will I know if it is charging the camera?
As far as I know you can't. But you can use dummy battery to power the camera from USB power source (laptop, power bank, etc.) like this.
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You can't. But you'll find USB chargers for the 7D batteries that you can connect to your laptop, or to a USB power adapter.
You can't charge a 7D Mark II battery via the USB port. You'll need to remove the battery and use an external charger to recharge it.
The main reason seems to be that the 7.2V batteries used by the 7D Mark II and many other Canon 5-Series, 7-Series, and x0D series cameras require more voltage to charge than what the vast majority of USB chargers and ports in existence can provide.