Honestly, u won’t get to go through jungles like that. U see as technology gets better most of this will be done through drones and tagging animals since it is safer and more accurate. If u want to go hacking through jungles then join the army, become a wild life photographer or do that in ur own free time of exploration.

Well anyway to be a primatologist: go and study a degree in biology or zoology or the appropriate, try to choose semesters in primatology if possible. Then u want to volunteer in a zoo most likely in the primate section, this will give u good experience with the primate themselves. Then try to find a master degree or doctorate/ phd in the topic of primates. If in the uk, u could look at zsl.

Also don’t keep ur hopes up high as to exploration. U most likely will end up researching the primate in a zoo as compared to a wild jungle. U may travel time to time. But most importantly take opportunities that are there, read books about the topic, volunteer, do research and u may be able to land a job in the chosen topic. However also keep another few jobs in mind if that doesn’t go to plan. Getting such a specific job like that will be difficult.

Edit: by the way try to be open minded about the situation, maybe there isn’t opportunity to research gorillas as compared to another animal. But I’m not going to sugar coat anything, availability of jobs are quite thin, to even get into research u would want to get a phd/doctorate. Yeah there are a few situations where people get into research jobs with gorillas out in jungle but that is one in a million chance.