1. Is video calling safe
2. are there any chances of some other persons hacking of my private video chat
1. Yes. Totally safe if it is a Skype-to-Skype call.
2. No. All Skype-to-Skype calls are fully encrypted.
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I recommend that you always run the latest software version: Windows & Mac
If my advice helped to fix your issue please mark it as a solution to help others.
Please note that I generally don't respond to unsolicited Private Messages. Thank you.
just to add up, having a fully updated, trusted, and reliable anti-virus/firewall would also keep your account and conversations much more secured.