The odds would vary depending on the course, conditions, skill of the player, etc.
Golf is a very popular pastime (one estimate I found is 377,000,000 rounds played per year worldwide!) which means a lot of opportunities for someone to get a hole in one.
Even if the chances of multiple holes in one are minuscule - say 1 in 100 million - that means it would happen somewhere on the planet 3 or 4 times a year.
Do golfers wear gopros or similar to capture things like this?